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Thread: Shooting 40 SW from a 10mm auto pistol? Dumb or not?

  1. #11
    Site Supporter Trooper224's Avatar
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    Quote Originally Posted by JCN View Post
    I like my 9mm cylinders for my 357 revolvers... .
    I'm going to assume you know that's not the same as what we're addressing here.
    We may lose and we may win, but we will never be here again.......

  2. #12
    For the original topic, I s'pose that when it comes to such a practice (that is, firing .40S&W ammo through a 10mm chambered barrel), that just because we can do something does not necessarily mean that we should do it.

    The 10mm DW Specialist is one helluva nice pistol and not one I'd wanna risk damaging (unless saving my hide depended upon it) by running .40 S&W through it and I think you are wise not to.

    Heck, for not much money you could just buy a Glock 22 and shoot .40S&W all you want
    ''Politics is for the present, but an equation is for eternity.'' ―Albert Einstein

    Full disclosure per the Pistol-Forum CoC: I am the author of Quantitative Ammunition Selection.

  3. #13
    Agreed, I will not be firing anything but 10mm in my Specialist. I just wanted to know under what conditions someone might do it.

  4. #14
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    Yes, it can be done. I've done it in my SR1911-10 and XDM-10. I was pleased that accuracy did not suffer. It can possibly damage the extractor, but this is an easy repair. I don't do it as a common practice, but it's good to know it will work as a backup. YMMV

  5. #15
    Site Supporter KevH's Avatar
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    You can shoot 40 S&W out of a 10mm just fine with a properly designed and fit conversion barrel.

    I have a friend that has both a Glock 20 and Glock 40 configured with Bar-Sto conversion barrels and both shoot wonderfully.

    I have another friend with an older customized Colt Delta Elite that's been fitted with a 40 S&W barrel. Combined with Wilson 40 S&W magazines it's a great shooting gun.

    I would never consider trying to shoot 40 S&W out of a 10mm barrel.

  6. #16
    Frequent DG Adventurer fatdog's Avatar
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    Quote Originally Posted by KevH View Post
    You can shoot 40 S&W out of a 10mm just fine with a properly designed and fit conversion barrel.

    I have a friend that has both a Glock 20 and Glock 40 configured with Bar-Sto conversion barrels and both shoot wonderfully. .
    I have the KKM .40 conversion barrel for my G20 and it is quite reliable and accurate. Actually a joy to shoot compared to a G23/G22 gen 4 or earlier.

    As for relying on the extractor to hold the .40 cartridge in place in a 10mm barrel, I will pass unless it is an extreme emergency.

  7. #17
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    Quote Originally Posted by Rmiked View Post
    Agreed, I will not be firing anything but 10mm in my Specialist. I just wanted to know under what conditions someone might do it.
    Life or death emergency when 10mm is not available.

    10mm and 40 share breech face dimensions so if, for some reason, you wanted to shoot 40 s&w, like ammo availability, you could have a second barrel in 40 s&w fitted to the gun. That would address the headspace issue raised earlier in the thread. You may also need to use 40 s&w specific magazines for reliable feeding due to the shorter cartridge.

    This is a common practice with 38 super / 9mm guns.

  8. #18
    Quote Originally Posted by KevH View Post
    You can shoot 40 S&W out of a 10mm just fine with a properly designed and fit conversion barrel.

    I have a friend that has both a Glock 20 and Glock 40 configured with Bar-Sto conversion barrels and both shoot wonderfully.

    I have another friend with an older customized Colt Delta Elite that's been fitted with a 40 S&W barrel. Combined with Wilson 40 S&W magazines it's a great shooting gun.

    I would never consider trying to shoot 40 S&W out of a 10mm barrel.
    Same here. I have a 9 x 19 conversion for my .38 super auto. Which gives me a 3 caliber pistol, .38SA, 9mm and .22lr with a new top end.

  9. #19
    I have ran a few 40 S&W through my Glock 20 .. ran smoothly and seemed accurate... but a 40 S&W barrel is a better idea to me .. I have a 23 and 27 so I real have no need for that practice... saying that .. I have shot a 100+ of 380acp through a Hipoint C9 one day .. ran smoothly

  10. #20
    Four String Fumbler Joe in PNG's Avatar
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    I've considered having a .38 Super barrel fitted to my Colt LW Commander 9mm- and may yet do so in the future.

    I also have concerns about the possibility of getting things mixed up- probably better if I just stuck to what I already have.
    "You win 100% of the fights you avoid. If you're not there when it happens, you don't lose." - William Aprill
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