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'''.357 SIG''' is a type of [[ammunition]] for firearms. It is classified as a <span style="color:#0000AA">'''(P)'''</span>istol caliber.
.357 SIG is pronounced ''three fifty-seven SEEG''. .357 SIG is based on [[.40 S&W]], but necked down to accept bullets of the same diameter (.355/ 9mm) as those used in [[9x19mm Parabellum]]. The name was chosen because the ballistic performance of this caliber approaches that of [[.357 Magnum]], but it is designed to be used in semi-automatic pistols.
This caliber may also be known as '''9x22mm''', or simply '''.357''', though it is not encouraged due to the similarly-named [[.357 Magnum]].
