.40 and .357 Sig is that close ??

Seven© · 03-22-2008, 09:11 PM

I haven't kept up with the '.40S&W vs. .357Sig' threads/dramas. My apologies.

Stampings on a magazine from my Cougar .40 made me curious...

The magazine is marked 'CAL 40 S&W - 357 SIG'.

They're close enough in size to use the same magazine?

DWARREN123 · 03-22-2008, 09:19 PM

The 357 SIG is basically a 40 S&W necked down to 9mm so yes the mags are usually interchangeable.

mitch_mckee · 03-22-2008, 09:22 PM

Quote:

Originally Posted by DWARREN123

The 357 SIG is basically a 40 S&W necked down to 9mm so yes the mags are usually interchangeable.

Hmmm...can one swap out the barrel and have a dual claiber gun?

Seven© · 03-22-2008, 09:31 PM

Quote:

Originally Posted by mitch_mckee

Hmmm...can one swap out the barrel and have a dual claiber gun?

Yep, Mitch. That was my question #2.

But, what would be the advantage in that?
Higher velocity in a smaller bullet?
But, what's the advantage in that? Over penetration?

lefty o · 03-22-2008, 09:52 PM

yes, you can generally fit a second barrel and have a pistol that will fire both cartridges.

AKHunter · 03-22-2008, 10:04 PM

I thought alot about getting a .357 sig over a .40sw. I opted for the .40sw. I like the bigger hole idea and ballistics are rather close. BTW it is a .40sw necked to .357, not 9mm.

Quote:

Nope, the .357 Sig is loaded with .355" diameter bullets, the same as 9mm.
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Pumpkinheaver · 03-22-2008, 10:33 PM

Quote:

Originally Posted by AKHunter

I thought alot about getting a .357 sig over a .40sw. I opted for the .40sw. I like the bigger hole idea and ballistics are rather close. BTW it is a .40sw necked to .357, not 9mm.

Nope, the .357 Sig is loaded with .355" diameter bullets, the same as 9mm.

evilblackrifle · 03-23-2008, 12:24 AM

In a Glock, all you have to do is switch the barrels between the 357sig and 40. You have two guns for the price of an extra barrel.

03-22-2008, 09:11 PM	#1
Seven© Exalted Grand Poobah Join Date: Feb 2008 Location: WNC Posts: 731 Images: 15 Blog Entries: 2	.40 and .357 Sig is that close ?? I haven't kept up with the '.40S&W vs. .357Sig' threads/dramas. My apologies. Stampings on a magazine from my Cougar .40 made me curious... The magazine is marked 'CAL 40 S&W - 357 SIG'. They're close enough in size to use the same magazine? __________________ In Nomine Patris, et Filii, et Spiritus Sancti. Last edited by Seven©; 03-22-2008 at 09:13 PM.

03-23-2008, 12:24 AM	#8
evilblackrifle Senior Member Join Date: Jan 2008 Posts: 194	In a Glock, all you have to do is switch the barrels between the 357sig and 40. You have two guns for the price of an extra barrel. __________________ The patriot's blood is the seed of Freedom's tree.

03-22-2008, 09:19 PM	#2
DWARREN123 Senior Member Join Date: Jan 2004 Location: BETWEEN TN & KY Posts: 774	The 357 SIG is basically a 40 S&W necked down to 9mm so yes the mags are usually interchangeable. __________________ Have a nice day!

03-22-2008, 09:52 PM	#5
lefty o Senior Member Join Date: Mar 2002 Location: mn Posts: 4,785	yes, you can generally fit a second barrel and have a pistol that will fire both cartridges.