OOOD: McCann Industries .458 Win Mag Garand

Back in early 2000’s, McCann Industries (known for their M1 Garand Gas Trap Adjuster) manufactured an M1 Garand in .458 Winchester Magnum. Not made anymore after the passing of McCann’s primary gunsmith, the rifles are a fine example of ingenuity and practicality applied to big-game hunting.

At first, I flinched just thinking about it, but the few videos of it shooting shed some light on how this big-game cartridge is tamed.ย While the base rifle was identical, McCann added an aggressive muzzle brake and a mercury cylinder to the stock to absorb and deflect the recoil.


Nathan S

One of TFBโ€™s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSRโ€™s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


  • Jason Petty

    Mercury cylinder? Is that teally what it sounds like?

    • Christian Hedegaard-Schou

      Used to be a pretty common recoil reduction system, mostly for shotgun shooters. Not quite so common anymore. Midway still carries them as well as Brownells.

      Basically, it’s a sealed steel cylinder filled with mercury. Acts like a buffer against recoil. They’re pretty effective from all that I’ve read.

      • Jason Petty

        I wonder if they found better systems or just stopped because it was poisonous?!

        • El Duderino

          Sealed = not poisonous.

          Everything on or in a rifle is at least kinda poisonous if you consume it…

          • Giolli Joker

            Definitely, especially whenever lead bullets are involved.
            However issues with mercury filled components can be more in the manufacturing/disposal phases than during use.

          • sam

            Yeah, I mean, cadmium plated springs worry me bit, tho I’m glad they’re available.

  • Anton Gray Basson

    Coming from a guiding and anti poaching background, I really like this concept.

  • If i was a space-cowboy, this is what I’d use.

  • Zebra Dun

    “GASP!”, Be still My heart!
    Watch out shoulder…here it comes!

  • SP mclaughlin

    I still want a 12 gauge M1.

  • Paul White

    put this in the “i can’t afford it but damn I want it” category

  • J-

    I just found my Jurassic Park gun

    • Giolli Joker

      Mine is a BAR chambered in .500 Phantom.
      (And a Franchi SPAS-12, it has to be somewhere.)

      • Anonymoose

        Give me an M107A1 with a 20″ barrel and a sawn-off Browning Gold loaded with slugs.

  • David Sharpe

    Damn…..that is cool……I want.

  • Vitsaus

    There’s something weirdly cool about M1s that are chambered for non .30-06 cartridges. I think I’d empty my bank account for one in 7×57 or 6.5×55. I was too broke when SA was putting out .308 new production M1s at discontinued prices.

  • sam

    So nifty!

    Tho i’d skip the tubes, maybe add weight in the barrel and stock. I read a post or something years ago questing the effectiveness of mercury tubes, like, as compared to just adding solid weight. I’m no authority but it raised doubt in my mind.

    Also wondering if they could extend the magazin. Call me a knuckke-dragger, but to me that’d be a bonus.

    • sauerquint

      The advantage of the mercury tube was that it could be put in the stock for better balance.

      • sam

        I was unclear there. I can see adding weight to the stock, but why not something solid like lead or tungsten? I mean, since it doesn’t have to be in an oriented tube one has more options to control where the center of mass ends up…

        I guess there’s this idea that the mercury delays part of the recoil, like soaks up some momentum then ditches it later, but I’m not sold on the idea.

  • Devil_Doc

    Hah…! I’ve shot this gun. Recoil is about on par with a semi auto 20ga. They actually made several variations of this, including .35 whelen, and a few other calibers. My father in law was friends with Rich McCann… They did some really interesting conversions with the semi auto Mas to I think .280 Remington, 6.5, and a .308 that took FAL mags. Too bad Rich passed, dude was kinda brilliant.

    • smartacus

      That’s awesome! Hey, do you think it’s possible to make one in .458 Lott?
      Jack Lott’s cartridge is about 6mm longer overall, but the upshot is being able to shoot the “cheaper” 458 WinMag ๐Ÿ™‚

      • Jim_Macklin

        Look at the picture above and you’ll see the standard .458 Winchester has less than 2 mm clearance in the military .30/06 action.
        It might be possible to machine new receivers from even better quality steel. A new bolt might have to be machined too which means a new firing pin possibly.
        You could do it for $10,000 of custom CNC machining.
        Since the tyrannosaurus rex and the triceratops are hard to find, what would be the point?

        • Dan

          Speak for yourself, I just spent all morning cleaning up triceratops poo after a heard came thundering through my yard.

        • smartacus

          well i dunno if it needs better quality steel.
          i read somewhere about General Julian Hatcher’s saying Mr. Garand was building up higher proof loads from 70,000 all the way up to 120,000 psi. Then running an endurance test of 5,000 rounds of service ammunition afterwards ๐Ÿ™‚

          • Jim_Macklin

            Garands were built with 1939-1946 steel technology. The bolt lugs and locking recesses are not large. The larger case diameter of the belted magnum case increases the force on the bolt lugs by 40% over the 06 case with the same pressure.
            An automatic rifle in .458 Winchester does make some sense, but there is very little on planet Earth that needs rapid fire with 5,000 ft.lbs. of energy and 60 inches of penetration.
            If you want lots of power, get a Barrett M107 50 BMG

          • smartacus

            yeah, Garand noticed cracks forming in the left lug at 120,000 psi, then fired a 5000 round endurance test of standard ammunition on it without any further cracking.
            If 458 Win Mag’s 53,000 psi equates to a 40% increased force on the bolt lugs; that’s still only 74,200 psi .
            -Why would anyone need rapid fire with 5,000 ft.lbs? Because squirrels are fast :p

  • Sledgecrowbar

    You actually have to wear a shirt louder than the gun if you want to shoot it.

  • Sean Dockerty

    A Garand that looks like a Mini 14, what a twist! Those cartridges are big boys though.

    • Anton Gray Basson

      And they will let you know it.

  • Glenn Bellamy

    That’s a mighty handsome fella in the top photo (by Oleg Volk)! ๐Ÿ™‚ The recoil really is not bad at all, as configured.

    • Giolli Joker

      Yep, it looks like you’re handling it really well!
      Not hard at all to tell who is the photographer. ๐Ÿ™‚
      Is the gun yours or you just got a lucky chance to test it for Oleg?

  • Greg Willis

    This made my heart go pitter patter! I wonder if I can raid the Kid’s college fund or my 401K to buy it…. It would be perfect in 458 Lott for keeping rouge hippos out of my garden…

  • Robert Griffith

    I’d love to see/own one of these in .416 Ruger. Reminds me of conversions of an M-1 Carbine to .45 Win. Mag. that I used to see back in the mid-80’s.

  • Secundius

    At best it’s a Last Ditch Weapon, 5-round capacity, effective range of about 160-meters and a maximum of about 440-meters. A 500-grain Bullet?