.357 SIG [SEP] designer
.357 SIG
The .357 SIG pistol cartridge (designated as the 357 Sig by the SAAMI and 357 SIG by the C.I.P. or 9×22mm in unofficial metric notation) is the product of Swiss-German firearms manufacturer SIG Sauer, in cooperation with ammunition manufacturer Federal Cartridge. The cartridge is used by a number of law enforcement agencies and has a good reputation for accuracy.
History.
Developed in 1994, the new cartridge was named "357" to highlight its purpose: to duplicate the performance of .357 Magnum loads fired
the .380 ACP down to .32 caliber; and the .25 NAA (2004), necking the .32 ACP down to .25 caliber.
Due to its expense, as .357 SIG practice ammo is about twice the cost of 9mm and around 50% more than .40 S&W, .357 SIG never achieved widespread adoption like 0.40 S&W.
Cartridge dimensions.
The .357 SIG has 1.27 ml (19.5 grains HO) cartridge case capacity.
.357 SIG maximum C.I.P. cartridge dimensions. All sizes in millimeters.
Americans would define the