357 sig vs. .40 S&W
You are Unregistered, please register to use all of the features of FirearmsTalk.com!    

Firearm & Gun Forum - FireArmsTalk.com > Gear & Accessories > Ammunition & Reloading >

357 sig vs. .40 S&W

LinkBack Thread Tools Display Modes
Old 05-13-2010, 03:18 AM   #1
Feedback Score: 0 reviews
Gordo323's Avatar
Join Date: Sep 2009
Location: Sometimes in,Utah
Posts: 1,086
Default 357 sig vs. .40 S&W

Didn't know where to go to post this question, so here it is as I reload both calibers:
I have 3 Sig P-226s two in .40 and 1 in .357 sig, I have 15 magazines which all accept .357 or .40 and all fit in every gun.
I'm sure a .40S&W would not chamber into a .357 sig, but would it work the other way around ? And what kind of bad things would happen?
Just curious if anyone has made this mistake!

I swear, by my life and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine.
-Ayn Rand
Gordo323 is offline  
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here

Old 05-13-2010, 04:24 AM   #2
Feedback Score: 0 reviews
palabman's Avatar
Join Date: Mar 2010
Location: SW PA
Posts: 11
Likes Given: 1


I'm sure that the case would split at the neck and your accuracy would be terrible. Probably sound kinda funky, but I'm not sure it would damage the gun.

palabman is offline  
Reply With Quote
Old 05-13-2010, 04:55 AM   #3
Feedback Score: 0 reviews
Join Date: Feb 2010
Location: Vancouver,WA
Posts: 6,165
Liked 5012 Times on 2430 Posts
Likes Given: 1601


My son once mistakenly loaded a .45 ACP mag w/.40 S&W, loaded it into my Colt 1991 A1, and pulled the trigger.

Made a funny noise, like the shot was muffled and split the case leaving it stuck in the chamber. Had to tap it out w/a cleaning rod.

Did not hurt the gun but I can't say the same for his pride.

I think your hypothetical would have a similar rusult.
Tackleberry1 is offline  
Reply With Quote
Old 05-13-2010, 02:16 PM   #4
Feedback Score: 1 reviews
robocop10mm's Avatar
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Posts: 11,036
Liked 3692 Times on 1898 Posts
Likes Given: 426


Because the bullet would not attain a good seal inthe barrel, most of the pressure would be directed past the bullet. The case neck would expand in an attempt to fill the vacant space and may split.

You would not have dangerous pressures by any stretch of the imagination. You would likely have a fail to extract, but otherwise would not be "dangerous".
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball
robocop10mm is offline  
Reply With Quote

Thread Tools
Display Modes

Newest Threads