[Eric in the Ozarks]

“...357 Sig ?”
WTF ?

[mylife]

357 Sig is a spiffy cartridge.

[Bob]

“...357 Sig ?”

WTF ?

The .357 Sig is a cartridge for semiautomatics, as opposed to the .357 Magnum which is used in revolvers.

[Freedom_Is_Not_Free]

The .357 Sig cartridge was created in an attempt to get .357 Magnum bullet performance from a semi-automatic handgun. The .357 is only a revolver cartridge. The .357 Sig uses the same bullets and was created to try to mimic the Magnum's stellar performance.

Here is a comparison of the .357 Sig cartridge against the .357 magnum. The shorter .357 Sig is on the left. It's a great round.

.357 Sig.

Size comparison of .357 Sig and .357 Magnum. Sig on left, Magnum on right.

Size comparison of .357 Sig and 9mm.

Ballistic comparison.