The .700 WTF : For Hunting Dinosaurs

A member of the Cast Boolits forums posted photos and video of a rifle and .700 caliber cartridge he designed. The only component he did not make himself was the barrel.

The cartridge, named the .700 WTF (“What The F…”) and is made by fire forming a .50 BMG brass case, trimming it to 3″ in length and then sizing it. The round is loaded with a 1132 grain paper patched .700 lead cast bullet.

The rifle, with just a 16.25″ barrel, can push the 1132 grain of lead up to 2300 fps. Thats 13,000 ft/lbs of energy, right up there with the .50 BMG and far exceeding the .700 Nitro Express. The cast lead bullet has enough energy to pass clean through a 1/4″ steel plate.

The rifle uses a shell-holder style action. My understanding is that the difference between a shell holder and a bolt action is that a shell holder lacks an automatic ejector and must be entirely removed from the action in order to load a new cartridge. Note how in the video below the shell holder, holding the cartridge, it loaded into he rifle.

The rifle is accessorized with a Magpul pistol grip (probably the largest caliber gun to ever be fitted with a Magpul accessory), a Limbsaver recoil pad and a Aimpoint comp M4.

Juding by the video case extraction is tough. If you miss your shot at a charging Rhino T-Rex, you need to be able to reload quickly.

UPDATE: The inventor believes the rifle is not classified by the BATFE as a destructive because it is a sporting weapon. There is sporting weapons, such as shotguns and big bore double rifles, are exempt, the usual procedure it to obtain a letter from the BATFE stating that the particular weapon is a sporting weapon.

[ Many thanks to James T for emailing us the link. ]

Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


  • WoodenPlank

    I think the name is quite appropriate.

    • Brian P.

      Oh, come on. Have a sense of humor.

      • Austin

        Reading is fundamental…

  • Wow! Awesome Gun, that would knock down a T-Rex for sure, Now make one to take down a bunch of Zombies! LOL!!

    • Sid

      The zombies would have to line up.

  • JohnGalt

    God Bless America!

    • Heh. Reminds me of a Chris Titus joke.

      To paraphrase:
      Terrorists messing with America? Are you sure you want to do that? We build drag cars that go from 0 to 300 in a quarter mile because we’re bored. Imagine what we’ll build if you really piss us off.

  • J. Grigg

    That. Is. Awesome.

  • Flounder

    AWESOME job on the machining and build! This man is obviously skilled…
    Which makes me wonder why he didn’t build an extractor…?
    how much does it weigh!?!?!?!?!
    it looks incredibly light yet everyone is handling recoil like it’s nothing at all!!!

    • Chad

      14lbs minus the weight of the muzzle break.

  • Reverend Clint

    he should try n sell it to the FBI

    • El Duderino

      Yeah, I wonder if it’s a 100% stopper per FBI guidelines? πŸ™‚

  • C3P0

    It’s just so . . . so full of win

  • Juan

    Perfect weapon for Burt Gummer.

    • christian

      exactly my same thought :p

  • APBTFan

    What powder and charge weight?

    • Jim T

      it hovers around 190 grains of W748 powder

      • Byron

        how much does the rifle weigh? (trying to figure the recoil impulse, not counting the brake)

    • Jim T

      He said it weighs 14 lbs. with the aimpoint.

  • Andrew

    Best quote from the video:
    “The bullet only started out as 1132 grains.”

    Oh, is that all?

  • Wow! That is all.

  • W

    incredible…utterly incredible.

  • Brandr

    I wonder what the tax stamp costs for a destructive device like that?

    • Fred

      $200, like most other class 3 items.

      Some are only $5.

      This may be eligible for a DD exemption but I don’t know all the criteria for exemption.

      • Komrad

        The requirement for exemption is the ATF deciding it’s worthy. Technically, a cartridge must have sporting purpose, but thing s like the .950 JDJ, which has no such purpose, have gotten through before, as have all the big Safari calibers.
        Really, the ATF just doesn’t want 20mm Vulcan and similar stuff getting through.

  • Take that and shove it, “don’t kill any Dinos” Terra Nova Emo Series!

  • El Freddio

    Don’t let the makers of COD see it, or all the COD nerds will jump around ‘quickscoping’ and dual wielding it in the next Modern Warfare πŸ˜›

    • Komrad

      As an actual nerd, I take good hearted offense. COD kiddies are not nerds by any stretch of the imagination. Real nerds are busy either writing their own games or playing games that have some actual value to them beyond hype. /nerd

      • El Freddio

        Hey, I’m not trying to offend anyone. I love to play video games. I’m just hating on COD. Next time I will remember not to use ‘nerd’ if people are going to get so touchy about it.

      • SAM SNATCH


  • Brian P.

    Put a 20-24″ barrel on it, give it an extractor, and I’ll take one! I’m surprised to see how easily those guys are taking the recoil too!

    • Byron

      I think that tank brake on the muzzle has a lot to do with that, same as on most .50 bmg rifles.

  • Lance

    We all know dinosaurs are dead there for hunting terminators LOL. By the way ouch looks painful.

  • Isn’t it a Destructive Device? .50+ caliber, rifled barrel.

  • I am afraid I’ll have to side with gvass: rifled barrel, over .50-caliber, definitely a DD. I don’t think the BATFE will be much prone to give this an exemption.

    • Jim T

      I would have to say that if there is a public youtube video up with 15,000 views, and the ATF has not come knocking on his door, it is not a destructive device. Besides, if an over 50 caliber rifled gun is illegal, that puts alot of 577 t-rex’s and nitro express guns in an odd place.

      • Looks like you’re underestimating the facts that:

        #1 – Most of the over-.50 “safari” cartridges are well-established “sporting” calibers, some of them as old as over 1 century, and that would be hard for the BATFE to reclassify them, unlike what they could easily do for new developments.

        #2 – The guns normally chambered for those calibers are not “evil-looking”, this one is… and we all know what BATFE thinks about.

        #3 – The BATFE is usually “strong with the weak, weak with the strong” – a well-established gun company will have more chances that an amateur.

        Is not like I am saying that this *should* be a DD. I am just saying that I don’t trust the BATFE’s judgement in taking the right decision; we all know their well-established “position”, and we all know it’s all but permissive.

  • JimS

    The name has a lot of win!

  • DaveR

    I’ve been wanting a new squirrel gun…hmmmmm….

    • christian

      i am assuming your “hmmmmm” is to be said, stroking your beard (or wear your beard would be) and looking out to the upper-right and direction

  • Sporting Exemption should be easy to get. JD Jones does it often enough. Same with the 12 Gauge From Hell and its variants.
    Excellent concept and execution. The world needs more garage designers like this fellow.


  • Milo

    This is what someone buys when they have much more money than they do common sense!

    • Duray

      Or, it’s what someone builds when they have way more skill than time to spend watching Dancing with the Stars.

  • Nater

    Maybe with a magazine (3 rounds + 1 in the chamber) and a Mauser-style action, then I’d hunt T-Rex or Giganotosaurus with it. Otherwise, no thanks.

  • mosinman

    and here comes the ienvitable chuck norris joke…….
    chuck norris called and he said he wants his BB gun back

  • Matt Gregg

    Are they planning on making a magnum version?

    • mosinman

      i agree matt, the stopping power just isnt enough πŸ™‚

  • James

    I’m guessing he’s not keeping a spare bolt in the magpul grip?

  • JT

    So, for a “quick followup” you have to have a bandoleer with extra bolts and .700 rounds?

  • JR

    Is the short barrel so it can be used for home defence?

  • Jim T

    I’d like to add that the gun DOES have an extractor, just no ejector. The shellholder style action will extract the fired case, but you will then have to remove them from the bolt. P.S I’m NOT the inventor of this gun, I just followed the design and build closely and talk to the designer frequently.

    • Matt

      Forgive me if this has already been asked, or is a dumb question…. but I gotta know: where can I get one? or more appropriately, how much would it set me back?

      • Flounder

        He built it at home… I’m sure he’ll send you the specs! πŸ˜€
        But the whole point of this rifle seems to be 50BMG level of power in a gun that you can run cast lead bullets through.

    • noob

      how much are a couple of spare bolts that you can keep loaded with cartridges for quick reloads?

      Pop out the spent bolt, slap in a new loaded one…

  • Rob

    We’ll talk when it’s a necked up 20mm.

  • JeffreyB

    I wouldn’t buy it because of the name. A vulgarly-named cartridge doesn’t interest me as I left middle school many years ago. It’s unfortunate that the “coarsening of our culture” has made its way into the firearms industry.

  • Netforce

    Now what we need is the actual Jurassic Park.

  • Jeffery B is correct!! Having talent to make new or exciting guns or any product is one thing. Our society loosing its grip on decency, THAT IS something big. Just like beautiful women just because they are beautiful does not mean you want to get close to them. Case in point “porn chicks” Trash that will ruin your life. So we don’t need products with filthy names. Yeah I swear and use the F prefix to some things but I recognize where we are headed and it ain’t good so clean up your mind and mouth and live a better life. The inventors name and caliber is a better way to call that thing………HR

  • Whedgit

    Put a longer barrel on it and make a FMJ round for it. Would make an excellent anti-material rifle. It could easily crack an engine block or blow the tracks off a tank with a well placed shot.

    Or you could take it deer hunting…if you really hate deer.

  • John Doe

    For overkill purposes, I’m going to need one with an expanding bullet. Those pesky squirrels just don’t learn, do they?

  • Wow

    Wow, nice muzzle control while sweeping his friends. I mean it happens at times while training, but come on…

  • Im surprised that the kick doesn’t look all that bad in the video. Well, it looks bad, but I mean limbs are still attached afterwards and such.

  • ChrisC

    Great invention, awesome idea, but I agree with the comment up towards the top – EXTRMELY POOR FIREARM SAFETY. You guys need to do this cool stuff AND set an example that won’t get your video clip posted on Brady’s website as an example of why we shouldn’t be allowed to own even single-shot weapons…..

    • Agreed: It’s no excuse to relax safety because it’s a single shot firearm, as this breaks the instinctive habit we should all have about safe practices.

  • ndr

    there are sporting weapons. every single article i read on the internet has a grammatical error, and im getting sick of it.

    • Steve

      “there are sporting weapons. every single article i read on the internet has a grammatical error, and im getting sick of it.”

      Okay, if you want to complain about articles with poor grammer, you’ll need to learn grammer for yourself. Try this –

      “There are sporting weapons. Every single article I read on the internet as a grammatical error, and I’m getting sick of it.”

      Much better.

      • demonkoryu

        “Grammar”. Not “grammer”. It’s “grammar”.

      • You missed the “h” off has……:-)

        Anyway: If there’s one thing I love about firearms, it is their sheer diversity & this is one more added to the pool.
        Where would we be without the innovators & “off the wall” thinkers?
        Still shooting muskets most likely.

      • Henry Smith

        I think “has a grammatical error” would be even better. LOL!

  • ndr

    and who are the retards who shot this video??? isnt the impact, what the round does to the target what people really want to see?

    • I’m thinking the video is mostly for those doing the shooting & don’t we all like to see ourselves doing cool stuff?
      I thought the “after action” look at the bullet & plate was pretty informative.

  • Clayton Fowler

    People in America have a right to make what they like, with the right approvals They also have a right to call the gun and the bullet whatever they want. If you don’t want one because you don’t like it or the name, then don’t buy one. Even better, don’t even comment, if all you have is a negative comment…

    • Git Wood

      “Whaaa! whaaa! lol.neggy Buwetts? O0o0o0! it all, negative? (( 0))H! N))00o0o0o0o!

  • mike

    What a piece of work. No question about it. Humbug on the debaters of unnecessary and uncalled for effort. How many Yachts sit idle in bays for years, Cessna’s only touched for want of annuals? Comon pick up on the passion of this guy to DO something rather than armchair haggle over the accomplishment. Get out, shoot, build, fish, hunt or blast the hell out of a tin can with the kids or grandkids; commenting constructively if wonderful fodder for the future, cup half fullers are a dime a dozen and worth less.

  • What a great prarie dog round!

    Awesome, I was amased on how little loss of weight on the recovered round.

  • Kyle D

    I’ve always like the idea of single shot shell holder bolt actions. Where I live in northern Maine we do a lot of what we call “heater hunting” (driving around having a good time (not drinking), maybe a little hunting on the side lol). Anyway, buy simply having the gun in the seat with you, unloaded, but with a shell already mounted in the bolt, it is definitely faster to go from unloaded in the vehicle to loaded freehand than it is to load a shell into an internal magazine or to slap a detachable in and work the bolt, since its all one fluid motion, from mounted shell in the bolt to loaded, locked, and on target.

    • Git Wood

      “Injun’ say;”Heater hunting” is short for “Squaw humpin’ to stay warm in the T/P! or sweat Lodge. “Old lodgeskins’ Hates getting cold so lol..Cold is for hangin`shriveling meat. Incapable of arising in the great spirit ever again. Damn squaw make old warriors stay warm..’Mostly”..

  • Just a little history. About 20 years ago we made dies for a 70 cal based on a 50 BMG cut to 3 inches. Headspacing on the case mouth didn’t work too well & about a year later we made dies for a new belted cartridge & dies to form a belt on a BMG case to make the new ctg.

  • Patrick Boyle

    David Drake describes the appropriate rifles for hunting dinosaurs in his novel “Time Safari”. His hero chooses a bolt action rifle chambered in 30-06. Only the foolish and inexperienced go for bigger rounds. Don’t argue with me. Read the book.

    • Git Wood

      There is truth to the maxim : Its not how you pick your nose. But where and how, you apply the boogers ..sniff ..sniff.

  • Gunfan

    This is a sporting rifle. I believe that it has a place in both the Alaskan alders and the African veldt. When you hunt Cape Buffalo, you cant hit him TOO hard!

    • Git Wood

      Young Lions can run 100 yards with no heart beat “they” say..”Mostly’..

      • dhopper122

        Hit a “young” lion with this and you will turn him inside-out, heart beating or not. There is ALOT of kinetic energy there and alot of damage to impart on a soft target. Would love to touch a round off once, just for the experience.

  • demonantis

    Looks like it kicks like a mule. Always like the keep it simple creed. It would be neat to know what the effective range is if it has any.

  • rhobere

    this is a stupid comment to make, but I couldn’t call myself an engineer if I didn’t point out that ft/lb is not the correct unit for energy or anything for that matter. I believe you meant lb*ft or ft*lb. as in a force acting across some distance.

    • Git Wood

      I concur. Pretentious as hell comment. Not 1 soul here understands number weighings or squaring moduli or Obama care theorem.

  • bob gibbons

    What the heck, I think it’s time for a true “out of the box” engineer to come up with 1.0. Just for kicks.

  • Secundius

    Impressive, but not even a .700WTF (17.8x89mm) is not going to bring down a T-Rex.

  • Pat Boyle

    Everyone who fanticizes about hunting dinosaurs should read David Drakes’ ‘Time safari’. In that novel the ‘White Hunter’ uses a bolt action 30-06 shooting FMJ solids. BTW that’s exactly what I have under my bed. Don’t come around my house T-Rex!