AGAIN: 300BLK In 5.56 Rifle

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I have successfully avoided the 300BLK evolution that has occurred over the last few years. Mind you, not for any particular reason (other than the cost of stock piling yet another round). For me, suppressing a .38/.357 bolt action Ruger scratches the grin-inducing itch that comes with lobbing lead quietly.

But while the popularity of 300BLK grows, so does the chances of loading one of the oversized rounds into a 5.56mm platform. AR15 member ‘sdman11890’ recounted a hair raising experience from a recent trip to the range involving 300BLK in a friends new 5.56 AR15. He writes:

From the orginal post on AR15.com:

Took a friend of mine out with a rifle I had put together for him a few years ago; he’d never fired it. It’s a Spike’s lower with a PSA complete upper. 16″ Carbine length barrel.

He put about 100 rounds through it without any problems, it was running great.

He loaded up a mag and went to shoot it, and on the second or third round it blew up. It wasn’t too spectacular, smoke out the ejection port, magazine blew out. He was fine.

The BCG was locked up, with the bolt jammed in the extension and the carrier slightly back. I popped the takedown and pivot pins and pulled the upper forward enough to remove it from the lower. We couldn’t get the BCG removed at the range, and broke the charging handle trying to beat it open.

At the time, I thought maybe he had a squib and didn’t notice, or had a double charged load. He had an assortment of ammo, some PMC Bronze 55gr, some Armscor 55gr, some PMC Xtac 62gr, and some Herter’s steel case. The remainder of the mag that hit the ground was loaded with PMC Bronze 55gr.

At the time, I did not even consider that it could be a 300 blackout round. None of us there even own a 300 blackout, and we definitely did not have any ammo around.

Mistakes happen. However the most troubling part of this story is that neither ‘sdman11890’ or his friend own a rifle chambered in 300BLK, leading many to suspect that a 300 round could have ended up in a 5.56 somewhere between manufacturing and sales. In any case, this is a great reminder to remain vigilant  when loading magazines.

“Life is like a box of ammo. You never know what you are going to get.”

300BLK

Credit: sdman11890 @ AR15.com

300blk

Credit: sdman11890 @ AR15.com

300blk

Credit: sdman11890 @ AR15.com

300blk

Credit: sdman11890 @ AR15.com

300blk

Credit: sdman11890 @ AR15.com

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Credit: sdman11890 @ AR15.com

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Credit: sdman11890 @ AR15.com

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Credit: sdman11890 @ AR15.com

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Credit: sdman11890 @ AR15.com

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Credit: sdman11890 @ AR15.com



Pete

LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Pete.M@staff.thefirearmblog.com


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  • Vitsaus

    I’m starting to think that .300 Blk is even more dangerous to the common sense challenged than Tannerite.

    • Nebelwerfer

      If you already have TLMLDS (Tannerite lawnmower leg detatchment syndrome) a .300 Blk face crater is the next hot trend in redneck body modification.

  • Giolli Joker

    Uhm… redefining swaged bullets!

    • Andrew Miller

      A bullet un-swager.

      • supergun

        A swaging down~under.

  • Evil_Bonsai

    Uhm…Did the magazine load itself? If you’re loading up 5.56 and suddenly pick up a 300BLK and DON”T NOTICE, might want to reconsider gun ownership before someone gets shot with an unloaded rifle while cleaning it…

    • NDS

      Very little sympathy from me. Squibs happen, double charges happen… loading a clearly wrong round in a brand new rifle is negligence.

      • Phillip Cooper

        I don’t know what “brand new” has to do with that sentence.
        Would it have been acceptable if the weapon was well-used? No.

      • Michael R. Zupcak

        Does anyone else reading this blog think of the Harry Potter books whenever someone mentions a “Squib”?

        • Meatwhistle

          Glad it ain’t just me

        • rjackparis

          its the other way around for me.

          also, think special effects, squibs are the small charges placed under a blood pack to simulate a bullet hit on body

        • Leadsled

          No…..

        • Rick Kirkpatrick

          Ack! Filch! Mrs. Figg!

    • Tyler John Richards

      That’s what I was just saying to myself. How do you not notice one round looking completely different than the other rounds in the magazine? the base is the same width sure, but the projectile is clearly and visibly different

      • Tobiah

        I can tell the difference by more than just sight. 300 weigh a considerable amount more than 5.56 and sound different when loading in the magazine. I’m extremely curious how he was loading the magazines.

        • Old Vet

          I am curious too. Was he using one of those multi-round loaders. I could see how that might happen.

          • AlDeLarge

            That’s what I was thinking. 50 round boxes flip right into those. I think they do. If you have to put them in the special plastic box first, it would be less likely to not notice the different round.

      • Bill Funk

        If you’re sitting in your easy chair, watching your favorite DVD, while loading your mags, it can happen easily.
        Not from my experience (knock on wood); when I do this, I always check before I start loading to make sure I have *only* the one type of round available, checking each box first to make sure.
        Since I don’t have an AR at all, I can’t accidentally load a .300 by mistake, but I can see how it can happen.

    • Rick Kirkpatrick

      Obviously, we need the Nanny State to step in and pass another law to protect us from ourselves.

  • marine6680

    How it forced the bullet into the barrel… That is interesting, and probably what prevented it from being a much more dramatic experience.

    Probably a soft point type round or hollow point.

  • Bill

    No, there WAS at least one round of .300 BO around…the simplest explanation being best, I doubt that this is the full story.

    In inspecting zillions of factory rounds, I’ve found defects, but never the wrong caliber in a box or case of ammo. They typically aren’t made on the same lines or in the same runs

    • Erin

      I once found a 95 gr round nose (i.e., .380 ACP) bullet loaded into a 9 mm case in a box of factory new 124 gr 9 mm.

      • iksnilol

        That’s the new extra high velocity ammo.

      • Longhaired Redneck

        Willy Wonka ammunition! You found the golden bullet that the Oompa Loompa put in the box. Did you get your tour past the gates of the ammunition factory?

    • Nocternus

      Doesn’t stop some guy at Cabela’s from opening a box of 5.56 and a box of 300 Blackout and comparing them and putting them back in the wrong boxes.

      • Bill

        I’m sort of weird when it comes to buying anything: I always dig out an unmolested/unfingered/unsealed package from the back of the shelf, and check for damage/molestation/anything less than pristine.

        I also pay attention to every round loaded in a mag. Running a multi-caliber range, and having trainees load from buckets filled with hundreds of rounds, reinforces that for them and me.

        • Dixie Shooter

          I’m with you on this, I do the same thing. My wife hates it when I go digging deeper to get the one I like.

      • Nashvone

        That’s exactly what I was thinking.

      • Saw a gy do that with a box of .243 and a box of .308 at Academy once; pointed it out to the guy behind the gun counter and he called a floor manager to pull the boxes and escort the moron out of the store.

        • andrey kireev

          hey Uber, your name seems awfully familiar, did you used to post things on DA while back ?

          • I post everything new on DA and Tumblr as I make it; it’s mostly Magic Friendship Horses.

          • andrey kireev

            I knew it ! Although i couldn’t find you on DA for some reason when i looked.

      • Old Vet

        That is why the ammo that came into the gun shop where I used to work was never bought for stocking. Sometimes the sales people would offer money for their own purchases though. I could see how that scenario might play out. I have seen all manners of calibers mixed like that.

    • Kelly Jackson

      Did you ever find AP in your box of 9mm Tula?

      • Steve

        No, but in a box of Remington .45ACP 230gr. ball rounds I found one random flat-nose loaded round. Called Remington, returned said bullet to them, and they replaced the single round with eight 50 rd boxes of 230 gr.

        Looked it up later and it appears to have been a 185 gr. target round.

        Pays to be vigilant when loading mags in more ways than one, I guess…

      • Bill

        I wish, I haven’t had decent Euroammo since I ran through all my GECO, like an idiot.

    • Dixie Shooter

      No excuse for not paying attention loading the magazine, but the possibility of someone comparing the rounds in a gun store or where ammo is sold could have put the rounds back in the wrong box. People sure put parts back in the wrong boxes in hardware stores, for instance Lowe’s & Home Depot. Nothing more aggravating than sending someone there to get a much needed item and come back with the wrong thing due to it being in the wrong box. Still no excuse for this instance though.

    • Rick Kirkpatrick

      Pretty tough to miss the visual difference, too. Now that I think about it, the tactile difference is also pretty awesomely different.

  • Schnee

    Ima stick with my Rossi .45 Colt lever action with a threaded barrel and Silencerco Octane. Much less tactical, stupid quiet.

  • The_Automator

    I would bet large sums of money that the round was on the ground or left on the bench and the guy put it in the magazine. I’ve personally seen it happen at least a dozen times. It’s almost always a handgun, usually .40 being the culprit one way or the other.

    • supergun

      If you think that is something, try shooting an AK 47 out of a 300 upper.

      • The_Automator

        I would also bet large sums of money that no one here can get an AK 47 to chamber in an 300 upper.

        • JSmath

          Oh, there’s gun porn of that somewhere on the internet…

          • The_Automator

            Rule 42

          • supergun

            short or long?

        • supergun

          I would like to see those photos, but I would not bet against you. I would not want to test that theory out either. Think I will stick to tried and true of loading the right bullet.

  • Harry’s Holsters

    The deformed bullet has to be one of the coolest things I’ve seen lately.

    When I buy a 300AAC it’s getting a different color and brand of magazines and Faxon Bands on the guns and magazines. I also think I’ll have separate range bags and probably not take both if I don’t really trust the people I’m with.

    • supergun

      Tip the 300 in yellow.

      • Harry’s Holsters

        I’m not worried about me confusing the rounds themselves. Other shooters and magazines do scare me though.

        • supergun

          U right.

    • Beju

      It reminds me of the manga The Enigma of Amigara Fault.

    • NDS

      I use all tan mags for 300blk. All black for 5.56. They are labeled and there are no exceptions… it’s not that hard.

    • Sianmink

      Yep. Black pmags for my 5.56, smoke Lancers for my .300. Never shall the two mix.

  • Andrew Miller

    My only thought is.
    He had his ammo in a “can”.
    Was at a range, somebody next to him had a “misfire”, ejected it, and it landed in his ammo box.
    Maybe.
    Always be careful loading mags.
    Especially at the range yapping with a range mate.

    Guy I knew put a 380 into his Pa63 by mistake because its mags and the Hungarian PPK clone he also had were identical except for the one had a silver color floorplate.

    • supergun

      hillary put it in there.

  • “The military should adopt .300 Blackout!”

    No.

    • Jared Vynn

      They should, but they should make a specialized m4 that uses aics magazines. Then they could share magazines with an m24 chambered in 300 blkout and not have to worry about mixing up magazines. But I just want cheap surplus 300 blackout.

      • It will never happen, sorry. The kB risk is way too high.

        • Jared Vynn

          Yeah, I’m holding out hope for law enforcement adoption though.

      • Ebby123

        Yeah, because who needs more than 10rnd capacity for an infantry rifle… ?

        • JumpIf NotZero

          Ya… Great idea to go to a single stack.

          • iksnilol

            It’s more reliable.

            Srsly guyz, let’s go for it.

        • Jared Vynn

          It would be AWB compliant, and you could chamber the rifle from .223 up to 308 with only a change in bolt/barrel and follower.

          • Gary Kirk

            And a military rifle needs to be AWB compliant.. That’ll be the day… Go kindly explain that explosive devices are illegal in the U.S. to all of our wonderful friends that would like to kill us.. See where that gets ya buddy

          • Jared Vynn

            Why so serious? Why should something be military or law enforcement only? Screw that noise.

            Although I was joking there is merit to my thought for civilian application. An ar style rifle you could change calibers from .223 to 308 win with only a change of upper, BCG, and magazine needed could be useful.

    • supergun

      Similar to the AK 47 ,,,,just better.

      • andrey kireev

        5% or so better performance over cartridge designed in 1940s, for over 400% the price ? No thanks, you can keep your .300BLK

        • supergun

          Do you know when the 308 and 30.06 were designed? I can buy my 300 Blackouts for .35 – .40 a piece. I have 2 Blackouts for less than $450 a piece. The 300 Blackout is a 308 in a 5.56 shell. Pretty neat little bugger. And the ballistics are impressive under 500 yards. And last but not least, you can swap both the 5.56 and 300 Blackout upper is less than 15 seconds, can use the same lower, and magazines. That does not sound like 400% to me andy. I have 2 guns for your price of one gun. Long live the 2nd.

          • Gary Kirk

            “Do you know when the .308 and (AND!??) 30-06 were designed” Yes, I do.. do you???

          • supergun

            1906 for the 30.06 which was way before the 1940. 1952 for the 308 which was 2 years after the 1940’s. That is what we were talking about gary if you go back and read real slowly. Next question please.

          • Gary Kirk

            1952 was 2 years after the 1940s?

          • supergun

            Well 3 years after 1949. You do believe 1949 was in the 40s~~~do you?

          • Gary Kirk

            Yes, but 1952 wasn’t in the 40s

          • supergun

            Do you argue like this with your wife,,,,,if you have one. If this is all you got to worry about then you got it made. Damn, unbelievable.

          • Gary Kirk

            No, she has some degree of sense

          • andrey kireev

            I’m getting a feeling that we’re arguing with a child that lost an argument, so instead of bringing up any more points he resorts to personal insults. Very classy =)

          • supergun

            You started the stupidity. You can dish it out, but you can’t take it.

          • andrey kireev

            Go to Wikipedia, Search definition “Delusional”. Consult local physician.

          • supergun

            You are the one with the meds. Just don’t tell your doctor.

          • supergun

            I am very glad you have done that.

          • AC97

            Are you trying to be the next “Sermon 7.62”?

          • supergun

            Oh no. Another wanna be.

          • supergun

            I am glad someone does in your family.

          • andrey kireev

            you’re just tripping over your own words here, might want to stop before you become too confused.

          • supergun

            You sound like a liberal. I bet you are voting for hillary.

          • andrey kireev

            You sound like someone caught up in a bad position, by things you said, so you resort to insults to change the subject ?

          • supergun

            I am sorry I hurt your feelings.

          • andrey kireev

            Where you getting that from, kid ? Your reasoning/conversational/social skills seem to be vastly sub-par to that of an average person.

          • supergun

            You are sounding like hillary more and more. I would shut the hell up while you think you are ahead.

          • andrey kireev

            You’re right, I should just stop… Arguing with people like you is hopeless. Not even a GBU-57 bunker buster bomb will get through that thick skull of yours 😉

          • supergun

            Hasta~La~Vista.

          • Dixie Shooter

            He must not be allowed to talk at home so he has to unload here.

          • supergun

            You must be lonely?

          • Dixie Shooter

            Not near as lonely as you are.

          • supergun

            You must be a woman.

          • Gary Kirk

            And here that comes, guess you have a basement manufacturing process for your own suppressors for the zombie apocalypse also.. And note this.. I hate all that we are forced to choose from.. And politics turned off now.

          • supergun

            You stupid. I have no basement or reloading. What an idiot.

          • Gary Kirk

            Die hard 300 BO fanboy, they come in all calibers, colors and makes.. Hell, I’m probably guilty of it in some way (M-16A4).. Just fun

          • supergun

            M-16~~~LEGEND.

          • supergun

            You just can’t read as fast as I can change out a 300. So sorry. Go back to your room and come out when you can behave. Just answer the question if you can remember it.

          • andrey kireev

            Let’s see, I can grab another rifle in about a third of that time.

          • supergun

            You were ordered to your room. You are dangerous with a gun, son.

          • Dixie Shooter

            He’s a math genius isn’t he!

          • Dixie Shooter

            Hey hotshot, here is your post on that one. “andrey was talking about cartridges in the 40s. The 308 and 30.06 were developed in the 50s or maybe as early as the 40s. That is what I am talking about.” You need to go back and read slowly and talk even slower until you can get it correct.

          • Tritro29

            Well after all Sermon wasn’t banned. Or you got the same specimen in “Ar-15 mall ninja edition”.

          • supergun

            Read the original comment then come back and comment something intelligent.

          • Dixie Shooter

            I did, It is your comment genius, copied from above. Here it is again in it’s entirety with all your intelligence showing. Are you denying you wrote it?

            supergun TexasUberAlles • 15 hours ago

            andrey was talking about cartridges in the 40s. The 308 and 30.06 were developed in the 50s or maybe as early as the 40s. That is what I am talking about. He was insinuating that the 300 blackout was not much better than the AK 47 that was developed in the 40s. Surely you are much smarter to know that most people know the difference between the 300 and 308. Now if you are talking about the 300 WIN MAG, then that is different, but I know you know better. I think the 308 is the best of the best, but the 300 has a place in the history books.

          • AC97

            Is he really this dense?

          • Dixie Shooter

            Must be. I think he’s in dire need of attention and this is the only way he can get it.

          • supergun

            andy said that the 300 was only 5% better than cartridges developed in the 1940. The 30.06 was developed before the 40s and it is much more powerful than 5%. The 308 was developed in 1952 and it is even better than the 30.06. I was just commenting that I thought the 300 Blackout was a good defensive weapon and it was versatile. Then the freaks came out like the walking dead. Hasta~La~Vista.

          • If you think .300BLK and .308WIN are comparable in any way other than caliber then you should probably check some charts and graphs before you place any bets.

          • supergun

            andrey was talking about cartridges in the 40s. The 308 and 30.06 were developed in the 50s or maybe as early as the 40s. That is what I am talking about. He was insinuating that the 300 blackout was not much better than the AK 47 that was developed in the 40s. Surely you are much smarter to know that most people know the difference between the 300 and 308. Now if you are talking about the 300 WIN MAG, then that is different, but I know you know better. I think the 308 is the best of the best, but the 300 has a place in the history books.

          • andrey kireev

            7.62×39 and 300BLK are directly comparable, since they are intermediate rounds. 308 and 30.06 are full rifle cartridges, and have nothing to do with the other two. No one is insinuating anything, except you here, buddy.

          • supergun

            Your meds must have been delivered to you late this month. Go back to sleep. I don’t know what the hell you are talking about.

          • andrey kireev

            Did you even read half the stuff you wrote in previous comments ? I’m going directly off that. the only person here who needs meds is you, for memory loss you seem to have.

          • supergun

            Don’t discuss this with your doctor. They will come and take your guns,,,,if you have any. Just concern for you.

          • AC97

            Seriously, did you whack your head on something?

            Absolutely nobody mentioned full-power cartridges like .308 or .30-06 until you brought it up for literally no reason at all seeing as he was talking about intermediate cartridges only. You went completely off-topic by bringing that up, and you’re saying that he’s the one who needs meds?

          • supergun

            You must not have read the original comment someone made to me. What is your point other than wasting the space you are in.

          • supergun

            Don’t join the commenting unless you know what the hell you are talking about. You sound like a hillary loving liberal. I made the comment about how good the 300 was. Then some imbecile said that I was wrong because the 308 was better. Then you showed up with your bag of stupidity. Get lost.

          • iksnilol

            You said it was a “308 in a 5.56 shell” (actual quote).

            As far as I know that is wrong.

          • supergun

            Hopefully you don’t make decisions based on “As far as I know”, that can lead to making some serious mistakes like the article is talking about. I am 100% sure that I am correct.

          • iksnilol

            Well, most 300 blackout is either 220 grain subsonics or 110-120 grain supersonics. 308 is usually somewhere around 145-168 grains.

          • supergun

            Trust me (famous saying of liberal politicians) it is a 308. Look it up in WiKi if you have doubts.

          • iksnilol

            No doubt you can use 308 bullets in it. But most factory loads won’t have them in it. I can stuff a .44 mag bullet in a 7.62x54mmR case but it still don’t make it a .44 mag in a 54mmR shell.

          • supergun

            This is the last time I am going to say this. The 300 Blackout is a 308 bullet in a 223/5.56 shell. There is nothing complicated about this. Now if you have any other proof, then show me. If you don’t then, lets discuss something else. Thank you.

          • Don

            Not to stir the pot any further, but… Don’t you mean “case” and not “shell”? A casing is what the bullet sits atop of and a shell is a complete round. Just saying 🙂 🙂

          • supergun

            Thank you for that information. I know that I am not right all the time, just some of the time. Always good to learn something else. The way I understand it is, a 300 Blackout is a 308 bullet in a 223/5.56 shell. It is a very versatile round. More than enough within 400 or 500 yards. If anyone needs to reach out and touch someone,,,,say 1,000 yards, then the 308 caliber will do that. The 300 Blackout will fit in the AR 15 magazines, lowers, uppers, same bolt and charging,,,just change out the barrel. Quicker to change out the upper. I believe the 223/5.56 is an awesome bullet within 300 – 500 yards. The 300 just makes that platform even better. I can carry the 300 and 5.56 with all the ammo a whole lot better than carrying a 5.56 and a 308 with all the ammo. Just saying.

          • AC97

            Hey genius, seeing as you seem to possess less reading comprehension and proofreading ability than my fecal matter, they were talking about 7.62×39, given that you brought up the AK to begin with, as proven by this quote: “5% or so better performance over cartridge designed in 1940s, for over 400% the price ?, No thanks, you can keep your .300BLK”, then you brought .30-06 and .308 into the conversation for no reason whatsoever.

            You’re the one who decided to mention .308 and .30-06 in the first place, so don’t blame others for your stupidity.

          • supergun

            Hey AC97. I see that they let you out. That is great. andy said that the 300 was only 5% better than the bullets developed in the 40s. I just brought the fact to his attention that the 30.06 was developed in 1906 and the 308 was developed in 1952, just 3 years past the 40s. What is so hard to understand. Unbelievable. Stay out of trouble AC, or they will come and get you again. Oh, by the way AC, those bullets developed in the 1940 are much better than the 300. You probably never owned a gun, so I can understand your comment. Stay out of trouble and take those meds when you are suppose too.

          • AC97

            What’s so hard to understand about the question “How is that in any way relevant to what he was talking about?”?

            You took a statement on how the .300 Blackout is only about 5% better than 7.62×39 as implied by the fact that he replied to this comment:

            “Similar to the AK 47 ,,,,just better.”

            And then you brought .308 and .30-06 into it for no reason whatsoever.

            And you do know that the 7.62×39 dates back to 1944, right? It was extremely obvious that he was talking about 7.62×39, not .308.

          • ostiariusalpha

            .30-’06 was developed in the 50’s? Cool story, bro.

          • supergun

            The 30.06 was originally developed in 1903. It had a round head. Do your research. A fifth grader can do this.

          • ostiariusalpha

            That was the .30-’03, it had a different neck length than the .30-’06. The new cartridge was developed to use the type of spitzer bullet that the Germans had revealed in 1905. But you keep deluding yourself that you know what you’re talking about, that’s what you’re good at.

          • supergun

            The 30.06 was introduce in 1906 in the Springfield 1903 bolt action rifle.

          • AC97

            And a fifth grader would actually bother to read their comment to check whether they contradicted themself or not, and to quote you in the comment that “ostiariusalpha” replied to:

            “The 308 and 30.06 were developed in the 50s or maybe as early as the 40s.”

            Emphasis mine, and are you really this retarded?!

          • supergun

            308 was developed in 1952. Not that hard to understand is it?

          • AC97

            “AND 30.06”

            If you’d read your own comments, you’d see what the issues are.

          • Mark

            It’s almost like it was developed just in time for the M1903 rifle that made its debut in 1993. After Desert Storm the AR-15 was dropped in favor of a wooden stocked, bolt action rifle. Of course this was before 2005 when Kentucky Long Rifles replaced the M1903 because a rifle with long range was needed in the mountains of Afghanistan. Made famous by the Kentucky Army Reserve units who were the first to adopt the rifles of course.

          • Evan

            Yeah, but this outdated technology is being replaced by matchlocks. Gotta love that match accuracy!

          • supergun

            Hasta~La~Vista. What an idiot.

          • Old Vet

            Wow, I must have been in a time-warp because I was shooting that old M-14 in 1963…..but I can say I missed my flintlock I had at home though.

          • Dixie Shooter

            The .30-06 Springfield cartridge (pronounced “thirty-aught-six” or “thirty-oh-six”), 7.62×63mm in metric notation and called “.30 Gov’t ’06” by Winchester, was introduced to the United States Army in 1906 and later standardized; it remained in use until the early 1980s.

          • AC97

            Obviously, he didn’t get the memo that .30-03 and .30-06 are separate cartridges.

          • supergun

            I have never commented on the 30-03. Why are you making things up? Don’t make a comment unless you can be truthful.

          • AC97

            I’m saying that you falsely claimed that .30-06 was developed in 1903.

            Quote: The 30.06 was originally developed in 1903. It had a round head. Do your research. A fifth grader can do this.

            I guess they didn’t have to rechamber their rifles after they replaced them, huh?

            Before you go around calling people idiots, read your own comments.

          • supergun

            The 30.06 was developed in 1906, hence the 06 in the 30.06. It replaced the 30.03 that was developed in 1903. The 30.06 was used in the Springfield 1903 bolt action rifle.

          • AC97

            I’m aware of this, it’s just that you’ve made a comment that said otherwise:

            “The 30.06 was originally developed in 1903. It had a round head. Do your research. A fifth grader can do this.”

            Did you specify a rifle? No, you didn’t.

          • supergun

            I did read that in my research. There was a 30.06 bullet with the round head that was developed in 1903. There is only 3 years difference between 1903 and 1906. I don’t know why you are wasting my focking time over a possible typo. Unbelievable. Is this all you have to do all day long. Must be focking nice.

          • AC97

            And it seems that you didn’t read that 7.62×39 is a cartridge from the 1940s in your “research”, right? How did you get “he’s talking about .308 and .30-06” from a reply to your comment about the AK47? He’s obviously talking about how expensive .300 Blackout is compared to 7.62×39.

          • andrey kireev

            Okay buddy, come back to me when you actually use that feature. You might as well have two separate guns at that point, especially if you’re going to mount specific handguards you like, as well as muzzle device, let’s not forget dedicated optics you have zeroed for specific caliber and ranges. 5.56 rifles go for about as much, AKs aren’t much more expensive, considering how cheap 7.62×39 is right now. 300BLK is comparable to said round, and by no means resembles .308 in ballistics.

        • Dixie Shooter

          You were comparing the .300BLK to the 7.62x39mm AK47 round which was created in the 1940’s weren’t you? In that case you’re very close.

          • andrey kireev

            yep =) that was in relation to his comment.

        • Price is getting down to about the same now.

          • andrey kireev

            not a chance…. when it’s still costs more than 5.56 it has a long way to go to reach prices of 7.62×39

      • iksnilol

        Not really, only better components are commonly used in it.

        • supergun

          The ballistics are better in the 300 Blackout.

          • iksnilol

            Not according to the ballistics tables I’ve seen.

          • supergun

            Depending on what type of bullet you use. What brand of bullet you use. I think the AK is a great weapon, but the 300 is interchangeable with all my AR Platforms. Work very good out of the AR platform. The AK bullet has issues in the AR platform, but that is because the AR rifle is loose as a goose. Made that way. We could argue about the pros and cons on this subject, but I have not retired yet. Maybe in about 10 or 20 years,,,iksnilol. You live in Baton Rogue?

          • iksnilol

            AR is loose?

            Nope, don’t live in Redneckistan, USA. No offense, but Red Jacket firearms comes from red stick.

          • supergun

            I met AK is loose. That is the beauty of the AK. It shoots everything lowdown and dirty. Both the AK bullet and 300 Blackout gets the job done.

          • glenn cheney

            Some screws “work” themselves loose, others come that way right out of the box. We be havin’ lots this thread. Did I tell ya’ bout tha’ time my Meanie Greenie, yea, you know, that one…that Grendel….got up against some 300 thing.
            Anyway, I’ll buy the locktite, ya’ll game?

    • TechnoTriticale

      My impression is that this interchange hazard is a direct result of:
      • wanting a larger AR15 caliber (understandable)
      • needing to fit an AR15 magwell (understandable)
      • wanting to use existing magazines (and their ribs, hmmm, caution there)
      • using a 5.56/.223 case head diam. (uh oh)

      Back when I was last contemplating a deer rifle, this IC hazard one of of the reasons I ruled out 300BLK. 6.8SPC and 6.5GREN, for example, don’t have this problem. As 300BLK grows in popularity, this sort of kaboom could become a weekly TFB story.

      IC hazards are by no means new, but historically, the firearms at risk tended to either be obscure, or to be an antique (e.g. .357 in .38LC, .38 Super in .38ACP). The former cases were simply rare. in the latter cases, the owners of such heirlooms tended to exercise more cautious stewardship in feeding their artifacts.

      The present story suggests that even if one only owns a 5.56/.223, vigilance needs to be cranked up a notch. That’s an annoying development.

      And I agree, if there’s a new military intermediate round, no way is it going to be 300BLK.

      • Brian Duffy

        I suspect this could be an issue with any of the rounds made to increase the bullet size with ARs. I just built my first 300 BO, but find the round significantly different enough I don’t think that is an issue. I run them in different color mags as well, not for that reason, but I guess it could help if I were really drunk and decided to do something I never do when drunk- shoot a gun.

      • Rick Kirkpatrick

        Not disagreeing but does this apply to the .308-cased AR-10 variants, too?

        • TechnoTriticale

          Probably not. The 300BLK case head is sufficiently smaller in diameter that controlled feed would not occur, and the round would likely just get shoved into the chamber, beyond the reach of the firing pin.

          Even with ignition, the bullet is already the correct caliber, so extreme swaging would not happen. No one will be reloading the ruptured case, tho.

    • CommonSense23

      It kinda already has.

      • People who know what they are doing use it. Make that round general issue, and see how long it takes for the Private Snuffys of the world to kb their 5.56mm rifles.

        Or worse, maybe Sgt or Lt Snuffy gets the bright idea that he can upgrade his squad’s firepower with this new round…

        • CommonSense23

          Don’t disagree with that.

        • Gary Kirk

          Holy lord you’ve opened the gates to the existing uber-round realm.. Maybe the gods be with you upon your”assault” of the ever apparent super round for the AR

  • Russ Kell

    All else aside, that Mr. Fantastic bullet looks neat.

  • Otm Shooter

    168 gr Sierra Matchking? lol
    Or a factory loaded 220 gr.

  • Bang Switch

    That sure is a funny looking bullet…..

  • AC97

    For the last time, is it really that difficult to look at the ammo you’re loading into your magazines?

    Now to wait for the next time some idiot covers their muzzle brake with a handguard…

    • Dixie Shooter

      You are absolutely correct there AC97. It’s all about paying attention to what you’re doing.

    • Rick Kirkpatrick

      Yup, with the visual and tactile differences between the rounds I’m pretty sure I’d be too embarrassed to let everyone know I did this. Who are these people?

  • Kivaari

    A couple defects I found in ammunition was a case that was too long in a box of GI Issue .45 ball and a Winchester Silver Tip .380 that was missing powder. The .380 when fired spit the bullet out and it bounced off the paper target. I extracted the case and found it full of brass polishing compound. Obviously the weight of the compound was close enough to the powder charge that it made it past the weight check station.

  • UCSPanther

    Now that is what I call an extrusion…

  • AHill

    I guess that’s one way to profile the inside of a barrel…

    • Gary Kirk

      Once fired throat-fitted ammo

  • gunsandrockets

    RUD

  • Joseph Walker

    Ok so in the artical they are blaming factory loads when clearly in the picture is a lyman calibor and a RCBS powder throwing scale… witch are both vital instruments when reloading. It is very easy when reloading to have bullets and crap all over your work bench and i bet a 300blk round got lost in the shuffle and they didnt pay attension yet again when loading up there magazine to go shooting. So im sure this is not a factory load problem. People need to be very carful when reloading. You need to have a good system and be organize or these things can happen.

    • Gary Kirk

      Maybe.. On your work station, seems like it might be common. Judging by your post. Normally when reloading, EVERYTHING is kept separate.

      • Dixie Shooter

        Exactly! I only have the components that I’m reloading on my station specifically to prevent mistakes from happening. Those photos are from the guy telling the story not the one that had the blowup. He said neither one of them had a .300 BLK rifle so I wonder about him reloading cartridges for a gun he doesn’t have. Who knows what really caused it.

        • BillC

          It’s the internet, we HAVE to take everything at face value. .
          He said he’s never ever, super-ever, had or reloaded for a 300BLK, so it’s true! It just magically appeared in a pile of mixed ammo!

  • I sold my 5.56 rifle a while back. When I built my 300 BLK rifle I made the decision to go all in on the caliber (partly for this very reason). I use to second guess myself, but as I see more and more stories like this I’m glad I didn’t cave in. Besides, it finally got me into reloading!

  • RickfromPaso

    I’m surprised the bolt could close on it.

    • Sianmink

      If the crimp isn’t tight, it will set the bullet back into the case.

  • Jared Vynn

    the AICS magazine has the same body for 308 and 223/556 only the follower/spring are different meaning the lower could be the same for either caliber or their derivatives. And the AICS magazine isn’t unique and is in wide spread use already. And this is all just academic what ifs meant to be humorous.

  • Chris22lr

    Why these stories always happen to “a friend of mine”?

  • meadmkr

    I use 3 different color or magazine bands for the AR platforms I have and the stock/grip on my 300blk are also OD green.

    1) Green for 300 super (and the brass headstamp is marked green with a marker)
    2) Tan for 300 Sub (handloads are powder coated tannish 200+ gr hard cast).
    3) Black/metal for 5.56 (and the stocks/grips on the 5.56s are all black).

    Most importantly each person in the family knows the difference between 5.56 and 300BLK

  • Phillip Cooper

    The results are quite frankly, amazing. It literally made a mold of the bore, without exploding the weapon. Quite cool, and I’m glad noone was hurt.

  • Evan

    I once carelessly loaded a 7.62X39 into an AR mag, as we were using PMags for both the AK and AR we were shooting, and I wasn’t paying close enough attention. I immediately noticed my error, and took it out, though I did feel like an idiot.

  • Cal S.

    What’s next, do we need range marshals to ask “Excuse me, sir, did you load your magazine yourself or did someone do it for you?”

  • lets stop the insults and keep it civil—-

    • supergun

      All I commented on was, the 300 Blackout was a good defensive and versatile round. Someone commented that the 300 was only 5% better than cartrigdes back in the 40s. (What he was implying was: that bullets in the 40 were not as good as today which may be true). I replied that the 30.06 was developed in 1906 and the 308 was developed in 1952. Then the SHTF.

  • AC97

    I know that, it’s just that “andrey” has explictly stated that he was referring to 7.62×39 when he said “cartridge from the 1940s”, NOT .308 or .30-06.

    I’m just saying you brought it up out of nowhere, because once again, literally NOBODY brought up .308 or .30-06 until you did, if you don’t believe me, please read the comments section again, you’re the first one to mention those cartridges, and it was absolutely irrelevant to the conversation.

  • hal

    I would imagine that if a blind man had loaded that magazine, only 5.56 would have gone in. The blind use their other than sight senses very acutely, and would have immediately detected the increased weight and profile differences. But of course a blind man would not be pulling the trigger.

  • Warchild_70

    After 27 years of service in the Navy and Army Nat. Guard I do believe there was a total lack of awareness that one round in ten felt heavy and looked fat and was still loaded! I’m too old I guess to know anything about this ,300 BLK but it sure seems like a disaster waiting to happen. As I said before I use the KISS method .308 for hunting and multi caliber pistol in .45 Colt-.410 GA-.454 Casull. This man is very luck that the rifle was well made and didn’t become a handgrenade.

  • CJS3

    I have to call BS on this story. No one owns a 300Blk, but somehow the mag got loaded with a single 300Blk. Sorry, not buying it.

  • Nathan Means

    TFB- Look what this guy di.
    TFB comments- 5.56 vs 300blk

  • Rick Kirkpatrick

    NOT that tough to avoid this problem. When I built my 300 BLK 3-4 years ago I got green mags to match the color of the Magpul furniture. All my .223 mags are black. Pretty sure there’s some innovative method you could use that works for you. Sheesh!

  • Repoman3737

    I have this weird OCD thing I do when loading my AR mags where I make groups of 10 rounds layed out next to each other with multiple groups so I have enough together to fully load 10,20,or 30 round mags. It makes it so I don’t loose count of how many I put in a mag because I bet I’m not alone in trying to stuff 31 rounds in a 30 round mag. The biggest benifit is I get a good visual inspection of the rounds compared to each other as I load them and it’s easier to see mismatched and damaged rounds before loading one into a mag. I’ve only found an occasional dinged cartridge or bullet set to the wrong depth.