.510 Beck, A 690 Grain Subsonic Beast For Your .308 Lower

Perhaps 2016 is going to be the year of the “fifty” caliber toys and mods. ¬†Anything, really, to distract us from new colors… ūüôā ¬†Beck Sports LLC (out of Fort Worth) is playing around with a “new” round they are calling¬†the “.510 Beck”. ¬†They currently have a trademark live¬†on it (pending registration):¬†https://inventively.com/search/trademarks/86587155

The projectile itself is weighing in at 690 grains, and appears to be manufactured by Lehigh Defense and the entire round is supposed to fit in the length of a .308 magazine.  Which means you will be able to use it with a AR-10/.308 lower.  Lancer is efforting out the 10 round magazines (which you can see in the featured image on this post).  So basically, with the swap of an upper and your magazine, you can be chucking .50 caliber projectiles down range.

It also sounds like the plan for this is to be generally available as subsonic, though I am assuming there will be “faster” options available. I can’t imagine what that will feel like through that platform though (the non-subsonic that is).

A couple of places have had the fortune to see these out in the wild, and expect some more detailed coverage when we hit SHOT this year.

So, readers, what are your thoughts? ¬†interesting? ¬†Pointless? ¬†Cool, but I’d never buy it?

In the meantime you can follow Lancer’s page on Facebook at:¬†https://www.facebook.com/lancersystems/¬†and Beck at:¬†https://www.facebook.com/beckammunition/

Tom is a former Navy Corpsman that spent some time bumbling around the deserts of Iraq with a Marine Recon unit, kicking in tent flaps and harassing sheep. Prior to that he was a paramedic somewhere in DFW, also doing some Executive Protection work between shifts. Now that those exciting days are behind him, he has embraced his inner ‚ÄúWarrior Hippie‚ÄĚ and assaults 14er in his sandals and beard, or engages in rucking adventure challenges while consuming craft beer. To fund these adventures, he writes medical software and builds websites and mobile apps. His latest venture is as one of the founders of IronSights.com; a search engine for all things gun related. He hopes that his posts will help you find solid gear that will survive whatever you can throw at it–he is known (in certain circles) for his curse…ahem, ability…to find the breaking point of anything.


  • Absolutely ridiculous.

    I want one.

  • El Duderino

    Heck yes that’s cool. Standard AR10 bolt?

    • Rick O’Shay

      I don’t see how.

      • El Duderino

        Why not? Rim dimensions?

  • anon

    i would love to use this with a suppressor and a DIAS and murder hogs.

    • dshield55

      It would probably murder your shoulder instead.

      Recoil is momentum. Momentum is mass x velocity. A 690 grain .510 bullet going 1000fps has 64% more recoil than a 150 grain .308 bullet going 2800 fps. It’s going to have more kick than a .300 win mag and be almost a hostile to your shoulder as .338 Lapua.

      Can you imagine full auto .338 Lapua on your shoulder? Actually, that kind of does sound pretty damned fun.

  • thedonn007

    Is this related to the .510 Reed Wacker?

  • dshield55

    I’m super excited about $100 (probably) magazines for a .308 pattern rifle.

    Other than that, if you like .300 blackout, don’t see why you wouldn’t want a .510.

    • TechnoTriticale

      re: if you like .300 blackout, don’t see why you wouldn’t want a .510.

      If the goal is subsonic, and the ME of the BLK is too low for the application, the only way to increase it is to go heavier (not faster). Increasing the caliber provides more options for doing so. Increasing the OAL (which the AR-10 platform donates here) provides some flexibility on BC.

      • dshield55

        Exactly. Something like the .510 is was the only direction you could if you .300 wasn’t good enough. And that always kind of made me wonder why Americans were excetied about taking a .223 gun and shooting sub-sonic .300 ammo out of it when the Russians had already taken 7.62x39mm and upped it to 9x39mm for the same purpose.

    • JumpIf NotZero

      Maybe because blackout is a real round with real support and real availability. This is just some wildcat goofball.

      • dshield55

        .300 blackout had to start somewhere too. In it’s infancy there were a lot of detractors. Still are.

  • Darkpr0

    This looks similar to the Russian 12.7×55 subsonic round. It’s a good idea, 300 BLK has caught on greatly and a similar round for .308 makes lot of sense. The only scary bit of this is the potential violence of scaled up 300-in-223-kabooming but it’s possible the very rounded bulllets can preclude that from hapening. But I like the development of more options. They could have their work cut out providing ammo in the early stages if it gets popular.

    • TechnoTriticale

      re: scary bit of this is the potential violence of scaled up 300-in-223-kabooming

      Won’t fit through an AR-15 lower (OAL). This rather looks like a .50 Beowolf stretched for the AR-10 pattern lower. It probably won’t chamber in anything other than a .510 Beck upper.

      • Darkpr0

        Unless it can be crammed into a AR10 308 chamber and fired in which case the owner will have a very miserable day

        • TechnoTriticale

          Lacking any real detail on this round, my Eyeball Engineering‚ĄĘ suggests that the .50+ case diameter intrudes past where the shoulder would be on a .308 case, preventing chambering in a .308.

          But sure, if it can, beware. When I was looking for an AR-15 pattern deer gun a few years ago, I ruled out .300 BLK due to the frightful interchange hazard.

        • JumpIf NotZero

          In what possible way do you suppose a .50″ bullet is going ever fit in an AR-10 chamber?

          • iksnilol

            The dreaded forward assist strikes again!


        • Giolli Joker

          .223 and .300BLK have the same external diameter of the casing.
          This beast will be around .580 while the .308 is around .470.
          It is impossible to push the .510 Beck even in the worst and widest .308 chamber.

          • jmcelrone

            Did anyone read the part where it requires a different upper

      • Evil_Bonsai

        He meant similar to 300 in 223 (ie, someone trying to chamber a .510 Beck into a .308 as some have managed to shove 300BLK into a .223)

      • GearHeadTony

        .308win cartridge case base diameter = .4709″. How exactly would a .5100″ diameter projectile fit into that chamber???

  • Jess Johnson

    500 Phantom from TeppoJutsu, done long time ago.

    • Actually, the .500 Phantom used a fatter, bottlenecked case. This looks more like the old .50 American Eagle from SSK Industries. J.D. Jones opened up the mouth on a .50 Action Express case for use with .50 BMG projectiles.

  • Urker

    So does this make your rifle a DD?

    • TechnoTriticale

      re: So does this make your rifle a DD?

      Only [maybe] if the actual bullet diameter is over 0.5000000 inches, which is something that most developers of new cartridge avoid these days. What they CALL it is a different matter.

      • Steve

        I don’t know why they would call it the “.510 Beck” if it wasn’t .510… most bullets are one thou oversize, but 10 thou would be excessive.

        • Xtorin O’hern

          the .50 BMG uses a .510 diameter bullet but the bore diameter if the rifle is .500 to avoid being a DD, at least that’s what i’m told.

          • Austin

            The diameter across the lands is .500, the groove diameter is a smidge larger.

      • No, only the bore diameter matters, not the projectile diameter. The .50 BMG uses ~0.510″ projectiles. Most of the legacy .50 caliber sporting cartridges from the 19th Century use projectiles in the 0.510-0.512″ range.

  • Joe

    How about subsonics for the 45 Raptor?

    20 big rounds in unmodified magazines.

    I really wish this round had gone somewhere.

    • Austin

      I think a big part of the problem with the .45 Raptor is that they went with the .452 diameter used for the .45 ACP/LC, as opposed to the .458 diameter used with the .45-70, 458 SOCOM, etc. Most .452 projectiles top out around 300 grains, but .458s can easily be had up to 500 grain (and above). It would have been pretty easy to get serious .45-70 performance out of the .45 Raptor in that case, and probably would have given it a stronger following among reloaders.

      • iksnilol

        Can’t you resize the bullet?

        Is 0.06 of an inch that much in those big bore cartridges?

        • Austin

          You can resize .458 to .452, but there are limitations. You can’t do it with hard cast lead easily, and you generally need to swage it in stages. So you’d be limited to soft cast lead only, multiple passes through the die for each bullet, followed by hardening it. That also means you’re shooting unjacketed lead through an AR-10, which I’ve heard (anecdotally) can cause interesting fouling issues with the gas tube.

          That would also prevent you from using any of the fancy brass solids or anything with a jacket, really.

      • Joe

        Good point, .452 was a bad decision. Is there any way someone could change the specs to .458 and have a barrel chambered for it?

  • Xtorin O’hern

    why not the .510 whisper? someone should try and create a semi- auto that can handle that beast of a round

  • JumpIf NotZero

    Kinda nonsense. I know “50” is cool and all, but the selection of bullets in .45 or .416 or anything under .45 is not only greater – but how many 50cal silencers can you think of that would work for this?

    I can think of only Form1 cans.

    As where a .45 version might work in something like SiCo’s Hybrid.

  • John Bear Ross

    There is also a projected supersonic loading.
    327 grains at 2750 fps.
    That’s over 5400 foot-pounds at the muzzle (7400+ joules for you metric types).


  • Kyle

    I mean it is neat but I kinda of of the opinion that new AR rounds should try to follow the route of .300BLK Design the round to use as much of the standard gear as possible minimizing changes. Still I always like to see more AR stuff.

  • iksnilol

    This could possibly achieve over 2000 joules at 100 meters whilst being subsonic.

    AKA it would be legal for moose in Norway (with subsonic loads). Wonder how short of a barrel I can have with this cartridge? Would be an interesting candidate for an integrally suppressed bolt action.

    Was thinking 35 cm barrel (14 inches) with 15 cm of suppressor past the muzzle (6).

    • Giolli Joker

      If you go bolt action, just settle on the .510 Whisper of J.D. Jones (SSK Industries).

      • iksnilol

        Isn’t the .510 whisper harder to make a rifle for? What with being based on .338 Lapua.

        I am thinking as light as possible while maintaining 2000 joules at hundred meters.

        • Giolli Joker

          The Whisper can accommodate longer, heavier bullets.
          Wikipedia suggests Sako TRG-S as base rifle of choice, I think it’s not that hard to come by in northern Europe. ūüôā

          • iksnilol

            Oh sure, just let me get my Sako TRG money. ūüėõ

            I like the .510 whisper but it just seems so expensive. Expensive brass, bullets, and of course the rifle. I was thinking bolt action but I am leaning towards a single shot now. Thinking it’d be easier, shorter and possibly cheaper.

            The 50-90 sharps seems perfect. Since my calculations show that I need a 50 gram bullet (750 grains) and 320 m/s (1050 fps) to get 2600 joules. Considering the heavy loads fire a 36 gram (550 grain bullet) at 440 m/s I am not far off. Shorten the case a bit, load it with a heavy cast bullet (for hunting) and fast powder.

            Checked out the price of 50-90 brass. It’s about 1.5 dollars for Starline brass. About half the price of .338 brass. The bullets are really expensive so might as well cast my own.

          • Giolli Joker

            JDJ did quite a few single shots based on the TC Encore.
            Google 50-70-750. (750grs bullet on 50-70 brass).

          • iksnilol

            Don’t forget the 50 Alaskan. I saw a Ruger 1 chambered for it. Looked kewl. Could also go for a lever action, though I don’t know if I can build an integral suppressor for it.

            That 50-70-750 looks cool, though even “regular” 50-70 looks to be capable of doing what I want with it (subsonic with 2000+ Joules at 100 meters).

            Interesting there’s so many suitable choices, only a matter of finding the most inexpensive one ūüėõ

  • Anonymoose

    I heard that project was dead in the water years ago. :

    • Giolli Joker

      From what I remember, the availability of brass was limited and extremely expensive. Moreover the guy behind this, the .458 SOCOM and the .338 Spectre, Marty ter Weeme (according to the forum about his brainchildren) is now working abroad, unable to properly promote his wildcats.
      Luckily the .458 can somehow walk on his own legs… .500 Phantom and particularly .338 Spectre would deserve better chances.

      • Anonymoose

        The .338 Specter can be loaded using Starline 10mm Magnum brass, at least. The Phantom was totally proprietary, iirc.

  • J.J

    Maybe if this trend continues we can see some .50AE carbines.

    • Paul White

      Hell, I’d settle for some 10mm carbines

  • Ambassador Vader

    I thought any thing over 1/2 an inch was a DD, if it wasn’t a shotgun for sporting purposes?

  • Evan

    As this is bigger than a .5″ bore, doesn’t that make it an NFA item? It doesn’t seem worth the tax stamp and the nuisance.

  • Jwedel1231

    So, .50 Beowulf for .308 lowers?

  • Harrison Jones

    I would buy this in a heart beat. If I hit my commission goals for 2nd quarter I’ll be customer if the suppressor setup is right! These aren’t for the average shooter. They are for the serious subsonic nut of anyone who just wants something badass!

  • The Wound Channel


  • Hensley Beuron Garlington

    Our thoughts?! Who doesn’t love options that sound fantastic on paper. Hope they live up to the hype.
    What’s more American than bigger is better?!

  • Markbo

    Wont do anything my .458 SOCOM wont do better, for less $$