New From Wilson Combat: .458 HAM’R Caliber and Rifles

458 HAMR

By creating a hybrid AR-10/AR-15 rifle, Wilson Combat has been able to up the pressure of .458 SOCOM by over 31% and slightly lengthen the case. The end result is the .458 HAM’R caliber and the HAM’R rifles. If 3,000 ft-lbs of energy from an AR-15-ish-sized rifle sounds like your jam, read on for Wilson Combat’s brief press release plus photos and a video . . .


The HAM’R is designed from concept to completion to be the hardest hitting, most powerful (practical size) AR platform carbine ever produced, exceeding the ballistics of the .450 Bushmaster, .458 SOCOM and .500 Beowulf. By using an AR10 size bolt and barrel extension, this new cartridge is capable of handling maximum pressures of 46,000 PSI while enabling it to exceed 3,000 foot pounds of energy from a short 18” barrel. The .458 HAM’R is more than capable of cleanly killing any animal in North America, stopping a vehicle or blasting through a brick wall. Using purpose designed “hybrid” length receivers, BCGs that are ¾” shorter than a standard AR10 and feeding from a Lancer AR15 magazine, Bill Wilson and the Wilson Combat engineering team have produced the ultimate heavy hitting semi-auto carbine.


  1. avatar jwm says:

    Another niche round. If it’s still around in 10 years……..who am I kidding. I’ll just ignore it then, too.

    1. avatar anonymoose says:

      I’ll be surprised if it’s still around by the end of this year.

    2. avatar BLoving says:

      I still say .25 NAA and .32 NAA have a bright future.

    3. avatar Vic Nighthorse says:

      In 10 years it might be a moot question for any gun owner (former) foolish enough to be living in CA, no?

      1. avatar Sert says:

        Ten years? At this rate it’ll only take four years for most if not all of our gun rights to disappear here in CA.

        1. avatar Vic Nighthorse says:

          Or maybe president Harris will spread the joy to the rest of us.

        2. avatar California Richard says:

          Even the American plutocracy needs the blessing of Congress to pull such shenanigans. If Lord Obama and Pricess Hillary couldn’t, then don’t hold your breath for Duchess Kamala to work any miracles.

    4. avatar mrbadnews says:

      And when it flops it’ll be as easy to resell as a 50 Beowulf.

    5. avatar Brian says:

      3 grand just for the rifle will keep it REALLY niche

  2. avatar Brandon says:

    Hmmm, CMMG did the Hybrid ANVIL in 458 SOCOM and now the HAM’R Hybrid and beefier cartridge…seems like a direct challenge and a comparison is in order.

    1. avatar Joe R. says:

      Only one Hybrid can wield Mjöllnir.

  3. avatar SigLifeSailor says:

    I don’t understand, why would they lengthen the receiver if the cartridge was small enough to feed from a standard magazine? If it’s small enough to feed from an AR-15 magazine, wouldn’t that imply that it would fit into a standard receiver set as well? Am I missing something?

    1. avatar Anon in Ct says:

      Maybe the beefier BCG required it?

    2. avatar Jeremy S. says:

      The AR-10 barrel extension and BCG are a larger diameter. So is the chamber portion of the barrel, with thicker steel around the chamber. This is what’s allowing them to safely up the max psi of the round from .458 SOCOM’s 35,000 psi to .458 HAM’R’s 46,000 psi. Cutting that big of a hole in the AR-15 barrel doesn’t leave a lot of material around the chambered round. So what they’ve effectively done is increased the diameter of the upper to use AR-10 components while doing what they could to reduce the length increase you would otherwise get with those components (shortening the BCG back down, mainly). But, the AR-10 barrel extension and BCG are both longer than the AR-15 versions, so the receiver couldn’t still maintain AR-15 dimensions.

      I suppose if they thought the R&D expense would make sense, they could have designed a proprietary barrel extension and bolt and increased the AR-15 diameter without increasing its length, but it would have been a much bigger endeavor.

      1. avatar Rick says:

        So instead of making a proprietary upper, they created an entire proprietary rifle? Its not an AR10 or 15 so compatibility with anything is questionable. Does it need different feed geometry in the lower’s magwell or something?

        I guess its a WC, so cost effective isn’t that important when your goal is to sell 13 of them plus 300 rounds, ever. They should be made of gold pressed latinum.

  4. avatar DrewN says:

    Thank god this isn’t just an upper (looks in safe at various .450,.458,.500 uppers). I’m a sucker for big bore ARs.

    1. avatar George Reed says:


      Your favorite of ’em, man?

  5. avatar Dyspeptic Gunsmith says:

    A special lower, with a special BCG?

    Yea, that’ll really take off in the AR product space.

    Why not just shove a .375 pill on a necked-up, blown-out .308 case and call it good?

    1. avatar Vic Nighthorse says:

      Isn’t that the .375 Raptor?

    2. avatar jwtaylor says:

      .375 SOCOM. .458SOCOM case necked to .375. It launches a 200gr bullet from 2,400 to 2,500fps from an 18″ barrel out of a standard AR15 upper.
      The .375SOCOM meets exceeds the speed what my Speer reloading manual says for all of their 200gr .308 loads.

  6. avatar David says:

    Does anyone know the ballistics? Haven’t been able to dig it up yet even on the Wilson website.

  7. avatar W says:

    The shopping portion of the WC website says 300 grains 2000 FPS. Don’t know why they were focused on energy and pressure in their announcement. Most cartridges are compared by weight and speed.

    1. avatar David says:

      Thanks! The one place I didn’t look!

    2. avatar Nick says:

      Their commenting on pressure is in relation to the 458 Socom, which they’re trying to supplant. Since it uses a standard size barrel extension (modified only slightly to accommodate the massive case) it has to keep pressures relatively mild to keep from breaking off the lugs on the bolt, which has had much of its metal removed to accommodate the 308 sized rim.

      1. avatar California Richard says:

        Its a moot comparison. .458 socom was developed to function in a standard size AR with as few changes to the base AR as possible; barrel, bolt head, & slightly modified mags. By radically increasing the size of the gun and making all the parts proprietary it makes any comparison an apples and oranges contest.

  8. avatar Joe R. says:

    They claim it to be an anti-material rifle “stop an auto . . .”, who are they appealing to? (besides me).

    1. avatar million says:


    2. avatar MilitantCentrist says:

      Will certainly blow a fat hole through your wallet.

  9. avatar Ralph says:

    “The .458 HAM’R is more than capable of cleanly killing any animal in North America, stopping a vehicle or blasting through a brick wall.”

    But can it kill a grizzly driving a Buick behind a brick wall?


    Then who needs it?

    1. avatar jwm says:

      It can kill the grizz. As long as the shooter is sitting in the back seat of the Buick at the time.

    2. avatar MilitantCentrist says:

      Anymore you’ll probably have a harder time tracking down a Buick than a grizzly.

  10. avatar Em says:

    So what does this mean for Wilson Combat’s support of the .458 SOCOM?

  11. avatar Nick says:

    So it continues. Wilson slightly modifies an existing cartridge and gives it a new name. At least this time they’ve made a better rifle for it compared to the naked cash grab of the 7.62×40.

    1. avatar Rick says:

      And they’ll sell the exact same number of them.

    2. avatar Joe R. says:

      The 40 WT IS a good round and is a better round, thru an AR and bolt action platform, than the 300/BLK, especially at coming out of a magazine..

  12. avatar GS650G says:

    Should be a reasonably priced gun with readily available inexpensive ammunition.

  13. avatar Hank says:

    Hey what happened to that 6.8…or that other new 6.5 round… or .224.. or.. ok.

    1. avatar Rick says:

      If it was Federal/Savage, then I could get at least meh level excited, but this is an FK Bruno rifle, just because you can do something doesn’t mean you should. You could make a single shot 40mm Bofors, but why?

    2. avatar jwtaylor says:

      The 6.8SPC is still going strong, with plenty of rounds to choose from at the store (they had 5 different loads at Cabellas yesterday) and more and more manufacturers all the time. All of the major reloading manuals include data for it now.
      The 6.5 Creedmoor is so popular now that it is rare to see a large US rifle manufacturer make a new gun in .308 that is not also offered in 6.5 Creedmoor. Ammunition selection is plentiful, and there are dozens of loads for it in the manuals.
      The 6.5Grendel is popular as a second AR build, or an upgrade, and AR barrels for it are selling extremely well. Hornady makes multiple loads for it and it is listed in many, but not all, of the reloading manuals. Nosler has some nice loadings for it as well.
      The .224 Valkyrie is still new, and it may or may not catch on.
      The niche caliber is no longer niche. When reloading is easier than ever, and ammunition ships quickly to your door from multiple websites, people are willing to experiment.
      Ask any ammunition maker, niche is the new norm.

  14. avatar IdahoBoy says:

    Good squirrel gun.

    1. avatar Joe says:

      I don’t remember seeing any horse-sized squirrels when I lived in Idaho…

  15. avatar AFGus says:

    I would say Just take my Money, but its Wilson Combat, so I’m sure that I don’t have enough to begin with.

  16. avatar Bmworld says:

    I keep hoping someone would just built a 458 based on the AR 10 this is not the rifle I was hoping for.

  17. avatar BobS says:

    “The .458 HAM’R is more than capable of cleanly killing any animal in North America…”

    They’re not even restricting themselves by claiming the animal has to be a natural native of North America, only that it’s in North America for the occasion.
    Suppose a rhinoceros escapes from a zoo, and seeks concealment behind a hippopotamus who’s also on the lam, somewhere near Des Moines.
    You know .458 HAM’R is hard to find in Iowa, so you need to expend your ammo judiciously.

    When you need to cleanly dispatch both the hippo and the rhino behind it, and you can take only one shot, this is the rifle for the job.

  18. avatar Klause Von Schmitto says:

    For a big bore caliber in a standard AR15 lower I don’t think the 358 MGP can be beat.

  19. avatar miforest says:

    try to find ammo for the 223 WSSM, 25 WSSM, 270wsm,7mm WSM, 300 RSUM, 270 weatherby mag, 6mm PCU, 30 TC, 356 Winchester, 307 Winchester , or the 8mm Remington magnum before buy one of these. This list is just off the top of my head. there are many more cartridges introduced in the last few years that are complete orphans , with no ammo or components available . better buy a few cases of ammo and some dies if you get one of these.

    1. avatar jwtaylor says:

      I just went to and used the search bar. Every one of the calibers you listed is available, and all but one in multiple loads. Problem solved.

  20. avatar million says:

    i’m going to hold out until Radical Firearms makes the AR-pistol version.

  21. avatar Cabot Guns says:

    Wilson Combat… Another overpriced solution looking for a problem. It’ll be gone soon enough.

    1. avatar jwtaylor says:

      People have been saying that about them for 40 years now. And yet, they continue to grow, for 40 years now.

      1. avatar Cabot Guns says:

        The cartridge, Taylor, the cartridge…
        FYI: Tumors grow too.

  22. avatar raptor jesus says:

    Isn’t the whole point of 458 SOCOM to be low pressure, subsonic, and used with a suppressor?

    Which would mean that this round completely defeats that purpose . . . .

    1. avatar jwtaylor says:

      No, that was not the original purpose of the .458SOCOM. Subsonic use came up as a big bonus, but dramatically barrier penetration with an upper swap was what Teppu Jitsu was after at first.

  23. avatar ike says:

    give me a 30 round mag and a bumpstock and i’m sold

  24. avatar What I Know says:

    I have not met a Wilson Gun that will work right without major work on it.

    What makes me think another special 45 cal AR made by Wilson will work either.

    There is another 45-70 special AR that will not fill any real need, neither will this new round.

  25. avatar Ardent says:

    An impassioned defense JWT, but you know what they say about leading a horse to water. . . In the end the objections are logistical and pertinent; What does one do with a weapon that is heavily proprietary, firing a proprietary cartridge when ammo or parts are in short supply? Ditch it for something else is the short form answer. . . after one has exploited it and its ammo to best effect. When the cost of the rifle and its ammo are a major consideration. . . where resupply is limited due to either practical logistics or personal finance, it’s a major consideration. . . otherwise this thing is awesome. I can see both sides of the argument: It does what it does well, if you can afford it (financially or logistically or where both are the same consideration). From a practical standpoint, a simple AR-10 in .308 is probably a better choice. . . but man if I could afford the weapon and ammo, this is clearly superior from a performance standpoint. . .

    Keep in mind though that your audience largely isn’t comprised of warriors, but individuals of modest means who depend on their personal finance for resupply. The weapon is awesome, but the drawbacks are real enough, depending on ones circumstances.

  26. avatar Jim M. says:

    You know what Clint always says, when SHTF there’ll be .223 laying all over the place and all the spare parts your AR-15 will ever need!

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