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Posted On: 2/10/2021
By: William Hepburn
A: Thanks for reaching out William! Short answer, you can't fire 357 SIG in a handgun chambered for 357 Magnum, or vice versa. The 357 Magnum was originally developed as a very powerful revolver cartridge. The 357 SIG came several decades later. It was designed to perform comparably to the 357 Mag in terms of ballistics, but the 357 SIG is additionally designed to function in semi-automatic handguns. The two rounds actually have very different physical dimensions, including different bullet diameters. The 357 Mag also has a rim on its case that helps it chamber correctly in a revolver's cylinder. The 357 SIG doesn't have that.
If you have a 357 Mag revolver, you're limited to firing that ammo as well as 38 Special and 38 Special +P. We haven't got any of those in stock at the moment, but we do update our inventory often. I hope you'll check back in again soon!