Shooting .357 SIG in a .45 ACP 1911 ... really?

[MCMXI]

Supposedly there's an individual out there who managed to shoot five rounds of .357 SIG in his 1911 chambered for .45 ACP. I have to wonder if this is possible. Given the dimensions of the two cartridges I can see how .357 SIG rounds could be loaded into .45 ACP magazines and how they could be stripped from the magazine and chambered, but fired? The round would have to be suspended in the chamber by the extractor, and on firing would there be enough rearward force to push the slide back far enough to strip another round from the magazine? An individual claimed today that he shot five rounds before he realized there was a problem.

.357 SIG

1.140" max C.O.L.
0.424" case head
0.865" case length (0.381" diam. at case mouth)
0.355" bullet diameter

.45 ACP

1.275" max C.O.L.
0.480" case head
0.898" case length (0.473" diam. at case mouth)
0.452" bullet diameter

 

[stchman]

Supposedly there's an individual out there who managed to shoot five rounds of .357 SIG in his 1911 chambered for .45 ACP. I have to wonder if this is possible. Given the dimensions of the two cartridges I can see how .357 SIG rounds could be loaded into .45 ACP magazines and how they could be stripped from the magazine and chambered, but fired? The round would have to be suspended in the chamber by the extractor, and on firing would there be enough rearward force to push the slide back far enough to strip another round from the magazine? An individual claimed today that he shot five rounds before he realized there was a problem.

.357 SIG

1.140" max C.O.L.
0.424" case head
0.865" case length (0.381" diam. at case mouth)
0.355" bullet diameter

.45 ACP

1.275" max C.O.L.
0.480" case head
0.898" case length (0.473" diam. at case mouth)
0.452" bullet diameter

Me thinks that individual lied.

The .357Sig is a necked down 40S&W with a 9mm bullet. The entire cartridge would probably fall down the barrel of a 45ACP pistol.