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10mm / 40s&w
itchy300
Member Posts: 122 ✭✭
A friend of mine was told you could take a .40, change the barrel on it, and shoot 10mm. Is this true?
Comments
I do know for sure that with a Glock in 40 you can do a simple barrel swap to 357 Sig. If you swap barrel and mags you can also go to 9mm.
Jon
A friend of mine was told you could take a .40, change the barrel on it, and shoot 10mm. Is this true?
Its true with 40SW and 357 SIG. The 357 SIG was designed specifically to be barrel only drop-in conversion for most 40SW guns. So if you have a gun in one of those two, swapping to the other usually only requires a simple barrel change.
On 40SW to 10mm, there might be a few individual exceptions, but in general NO. . .this CANNOT be done safely/easily with the vast majority of .40SW pistols on the market. As already mentioned, most "service" 40sw guns are either built on 9mm platform frames, or proprietary 40SW type ones, and simply aren't physically large enough or built tough enough to handle 10mm rounds. Even if you did have the appropriate barrel made, the gun would beat itself apart with 10mm rounds pretty fast.
In a FEW cases where the gun is available in 10mm, then you might be able to do this sort of conversion, but even there "barrel only" probably wont cut it.
10mm is much hotter than 40SW and if you don't also swap out the slide spring for a stiffer one, you'll probably ruin your 40sw gun by beating it up with 10mm rounds. You may also want/need to change magazines as well.
Its probably fairer/easier to look at this in reverse. If you're starting off with a gun in 10mm, there is a reasonable chance you could convert it to 40SW. (You may be able to run 40SW straight through a 10mm gun WITHOUT conversion. . .but this is not sound practice, and probably best considered "emergency only").
As one example, large frame Tanfoglio (marked in USA as "Witness") guns can be swapped into 9mm luger 40SW, 38 super, 45 ACP, 10mm, and potentially a few other calibers by changing uppers.
S&W once made a revolver that used moon/half moon clips to hold the rounds, that you could shoot either 10mm, or 40 S&W in.
Lastly, don't evere let anyone tell you that a 40 S&W is the about the same power level as a 10mm, because it is not. When loaded to ther design intentions of both rounds, the 10mm, actually is right in there with bottom end 41 Magnum loads.
Best
quote:Originally posted by itchy300
A friend of mine was told you could take a .40, change the barrel on it, and shoot 10mm. Is this true?
Its true with 40SW and 357 SIG. The 357 SIG was designed specifically to be barrel only drop-in conversion for most 40SW guns. So if you have a gun in one of those two, swapping to the other usually only requires a simple barrel change.
On 40SW to 10mm, there might be a few individual exceptions, but in general NO. . .this CANNOT be done safely/easily with the vast majority of .40SW pistols on the market. As already mentioned, most "service" 40sw guns are either built on 9mm platform frames, or proprietary 40SW type ones, and simply aren't physically large enough or built tough enough to handle 10mm rounds. Even if you did have the appropriate barrel made, the gun would beat itself apart with 10mm rounds pretty fast.
In a FEW cases where the gun is available in 10mm, then you might be able to do this sort of conversion, but even there "barrel only" probably wont cut it.
10mm is much hotter than 40SW and if you don't also swap out the slide spring for a stiffer one, you'll probably ruin your 40sw gun by beating it up with 10mm rounds. You may also want/need to change magazines as well.
Its probably fairer/easier to look at this in reverse. If you're starting off with a gun in 10mm, there is a reasonable chance you could convert it to 40SW. (You may be able to run 40SW straight through a 10mm gun WITHOUT conversion. . .but this is not sound practice, and probably best considered "emergency only").
As one example, large frame Tanfoglio (marked in USA as "Witness") guns can be swapped into 9mm luger 40SW, 38 super, 45 ACP, 10mm, and potentially a few other calibers by changing uppers.
Very good explanation there.
Just to give a real-life example of this.....I have a Glock 29 10mm pistol. I actually run an aftermarket 23# spring in mine. I believe the factory spring to be too light when shooting 10mm loads where they are meant to be. I purchased a .40 conversion barrel made by Lone Wolf. I use that barrel, the factory spring(17#) from the G29 10mm, and the factory 10mm magazines and everything works great!
Jon
Their case head dimensions are the same, but due to greater cartridge length it simply isn't going to fit in most of those smaller frame size pistols the .40 S&W was intended for.