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.357 SIG
The .357 SIG (designated as the 357 Sig by the SAAMI and 357 SIG by the C.I.P. or 9×22 mm in official metric notation) is a bottlenecked rimless centerfire handgun cartridge developed by the Swiss-German firearms manufacturer SIG Sauer, in cooperation with ammunition manufacturer Federal Premium. The cartridge is used by a number of law enforcement agencies.
The .357 SIG is based on a necked-down .40 Smith & Wesson case, forgoing the large pistol primer utilized by the 10mm Auto in favor of the small pistol primer used in many common self-defense rounds, such as .40 S&W, .38 Special, 9 mm and other similarly-sized cartridges. Excluding specialized wildcat cartridges used in competition shooting — e.g., the 9×25mm Dillon, which necked a 10mm Auto case down to a 9 mm bullet — the .357 SIG was the first modern bottlenecked handgun cartridge to become commercially available since the 1961 introduction of Winchester's now-obsolete .256 Winchester Magnum, a .257 caliber round based on the .357 Magnum. Later the same year Remington and Smith & Wesson began jointly developing a similar round and, before the year's end, introduced the .22 Remington Jet, a .357 Magnum case necked down to accommodate a .22 caliber bullet.
Despite its favorable ballistics and performance, the .357 SIG has not achieved the widespread adoption seen with similar cartridges. One factor preventing the round from achieving greater popularity could be the cost of the ammunition, which frequently reaches double the expense of 9 mm, .40 S&W or .45 ACP ammunition. Because of this, as well as availability issues, some law enforcement agencies that previously adopted the cartridge have reportedly began to move away from the .357 SIG in favor of more common rounds with comparable performance.
The .357 SIG has 1.27 ml (19.5 grains H2O) cartridge case capacity.
.357 SIG maximum C.I.P. cartridge dimensions. All sizes in millimeters.
Several sources have published contradicting information regarding .357 SIG headspacing. This is due to the cartridge having been originally designed as a .357 (9.02 mm) round, but then rapidly adapted to the .355 (9 mm) bullet. According to the official C.I.P. (Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portatives) 2008 revised documents, the .357 SIG headspaces on the case mouth (H2). Some US sources are in conflict with this standard. However, the cartridge and chamber drawing in the ANSI/SAAMI American National Standards also clearly shows the cartridge headspacing on the case mouth. Likewise, US reloading supplier Lyman has published that the .357 SIG headspaces on the case mouth.
According to the C.I.P. rulings the .357 SIG case can handle up to 305 MPa (44,236 psi) piezo pressure. In C.I.P. regulated countries every pistol cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers.
The SAAMI pressure limit for the .357 SIG is set at 275.80 MPa (40,000 psi), piezo pressure.
While it is based on a 10 mm case necked down to accept 0.355-inch (9.0 mm) bullets, the .357 SIG cartridge case is slightly longer than the .40 S&W by 0.009 in (0.23 mm) to 0.020 in (0.51 mm) total. Most .40 S&W pistols can be converted to .357 SIG by replacing the barrel, but sometimes the recoil spring must also be changed. Pistols with especially strong recoil springs can accept either cartridge with a barrel change. Magazines will freely interchange between the two cartridges in most pistols. .357 SIG barrel kits have allowed this cartridge to gain in popularity among handgun owners.
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.357 SIG AI simulator
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.357 SIG
The .357 SIG (designated as the 357 Sig by the SAAMI and 357 SIG by the C.I.P. or 9×22 mm in official metric notation) is a bottlenecked rimless centerfire handgun cartridge developed by the Swiss-German firearms manufacturer SIG Sauer, in cooperation with ammunition manufacturer Federal Premium. The cartridge is used by a number of law enforcement agencies.
The .357 SIG is based on a necked-down .40 Smith & Wesson case, forgoing the large pistol primer utilized by the 10mm Auto in favor of the small pistol primer used in many common self-defense rounds, such as .40 S&W, .38 Special, 9 mm and other similarly-sized cartridges. Excluding specialized wildcat cartridges used in competition shooting — e.g., the 9×25mm Dillon, which necked a 10mm Auto case down to a 9 mm bullet — the .357 SIG was the first modern bottlenecked handgun cartridge to become commercially available since the 1961 introduction of Winchester's now-obsolete .256 Winchester Magnum, a .257 caliber round based on the .357 Magnum. Later the same year Remington and Smith & Wesson began jointly developing a similar round and, before the year's end, introduced the .22 Remington Jet, a .357 Magnum case necked down to accommodate a .22 caliber bullet.
Despite its favorable ballistics and performance, the .357 SIG has not achieved the widespread adoption seen with similar cartridges. One factor preventing the round from achieving greater popularity could be the cost of the ammunition, which frequently reaches double the expense of 9 mm, .40 S&W or .45 ACP ammunition. Because of this, as well as availability issues, some law enforcement agencies that previously adopted the cartridge have reportedly began to move away from the .357 SIG in favor of more common rounds with comparable performance.
The .357 SIG has 1.27 ml (19.5 grains H2O) cartridge case capacity.
.357 SIG maximum C.I.P. cartridge dimensions. All sizes in millimeters.
Several sources have published contradicting information regarding .357 SIG headspacing. This is due to the cartridge having been originally designed as a .357 (9.02 mm) round, but then rapidly adapted to the .355 (9 mm) bullet. According to the official C.I.P. (Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portatives) 2008 revised documents, the .357 SIG headspaces on the case mouth (H2). Some US sources are in conflict with this standard. However, the cartridge and chamber drawing in the ANSI/SAAMI American National Standards also clearly shows the cartridge headspacing on the case mouth. Likewise, US reloading supplier Lyman has published that the .357 SIG headspaces on the case mouth.
According to the C.I.P. rulings the .357 SIG case can handle up to 305 MPa (44,236 psi) piezo pressure. In C.I.P. regulated countries every pistol cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers.
The SAAMI pressure limit for the .357 SIG is set at 275.80 MPa (40,000 psi), piezo pressure.
While it is based on a 10 mm case necked down to accept 0.355-inch (9.0 mm) bullets, the .357 SIG cartridge case is slightly longer than the .40 S&W by 0.009 in (0.23 mm) to 0.020 in (0.51 mm) total. Most .40 S&W pistols can be converted to .357 SIG by replacing the barrel, but sometimes the recoil spring must also be changed. Pistols with especially strong recoil springs can accept either cartridge with a barrel change. Magazines will freely interchange between the two cartridges in most pistols. .357 SIG barrel kits have allowed this cartridge to gain in popularity among handgun owners.