Can .40 S&W be fired in a 10mm barrel?

[BerksCountyDave]

As we know, .40 S&W is a shorter 10mm.

So, can I fire .40 S&W safely from a 1911 chambered in 10mm?

[max384]

As we know, .40 S&W is a shorter 10mm.

So, can I fire .40 S&W safely from a 1911 chambered in 10mm?

No. Because .40 and 10mm both headspace off of the case mouth.

This contrasts with a .357 magnum and .38 special because these both headspace off of the rim of the cartridge, so additional length of the cartridge has no effect on headspacing.

[Noah_Zark]

Max nailed it.

However, if you have a S&W 610 revolver or any other S&W wheelgun in 10mm, you can use moon clips to headspace the shorter .40 S&W and shoot them in the 610 all day long. Night, too, if the neighbors are easygoing and amenable.

Noah

[Bib]

Probably would fire...as the others said, the round headspaces on the case mouth BUT....the extractor probably would hold the round against the breechface tight enough to fire. I doubt the gun would feed the shorter rounds properly.

[BerksCountyDave]

Damn. I've been hunting high and low for a 1911 in .40 locally. Found a 10mm, but no 40's yet.

[thelemite]

You can have a 40 s&W barrel fitted.

[BerksCountyDave]

You can have a 40 s&W barrel fitted.

Yeah, but I'm wondering what that would cost me after the cost of fitting the barrel plus the cost of the barrel itself.

[thelemite]

Yeah, but I'm wondering what that would cost me after the cost of fitting the barrel plus the cost of the barrel itself.

Good point

I have a double stack 40 s&W that I had a 10mm barrel fit for. it was about 325$ fitted.

[Dave_n]

Why not simply buy some brass from Starline, use the 180 grain bullets and roll your own 10 mm? Can download to 40 S&W levels or go up to full load 10 mm. Bear in mind that a 1911 with a 10 mm barrel may not have the original barrel as if memory serves me correctly, the Colt 10 mm was not called a 1911. Dave_n

[BerksCountyDave]

Why not simply buy some brass from Starline, use the 180 grain bullets and roll your own 10 mm? Can download to 40 S&W levels or go up to full load 10 mm. Bear in mind that a 1911 with a 10 mm barrel may not have the original barrel as if memory serves me correctly, the Colt 10 mm was not called a 1911. Dave_n

10mm brass is expensive and not all that common. .40 brass is plentiful and CHEAP.