.357 SIG

.357 SIG jacketed flat point cartridge

Type

Pistol

Place of origin

Switzerland
United States

Production history

Designer

SIGARMS / Federal Cartridge Co.

Designed

1994

Produced

1994–present

Specifications

Parent case

10mm Auto

Case type

Rimless, bottleneck

Bullet diameter

9.02 mm (0.355 in)

Neck diameter

9.68 mm (0.381 in)

Shoulder diameter

10.77 mm (0.424 in)

Base diameter

10.77 mm (0.424 in)

Rim diameter

10.77 mm (0.424 in)

Rim thickness

1.40 mm (0.055 in)

Case length

21.97 mm (0.865 in)

Overall length

28.96 mm (1.140 in)

Case capacity

1.27 cm³ (19.6 gr H₂O)

Rifling twist

406 mm (1 in 16 in)

Primer type

Small pistol

Maximum pressure (C.I.P.)

305.0 MPa (44,240 psi)

Maximum pressure (SAAMI)

275.8 MPa (40,000 psi)

Ballistic performance

Bullet mass/type	Velocity	Energy
115 gr (7 g) Doubletap Bonded defense JHP	1,550 ft/s (470 m/s)	614 ft·lbf (832 J)
125 gr (8 g) Doubletap FMJ-FP Match and Bonded defense JHP	1,450 ft/s (440 m/s)	584 ft·lbf (792 J)
147 gr (10 g) DoubletapBonded defense JHP	1,250 ft/s (380 m/s)	510 ft·lbf (690 J)
147 gr (10 g) DoubletapFMJ-FP	1,255 ft/s (383 m/s)	514 ft·lbf (697 J)

Test barrel length: 4 in (102 mm) rifled barrel.
Source(s): DoubleTap Ammunition, C.I.P.

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 American ammunition manufacturer Federal Cartridge. While it is based on a 10mm auto case shortened and necked down to accept 0.355-inch (9.0 mm) bullets, the .357 SIG brass is slightly longer than .40 S&W by 0.009 in (0.23 mm) to 0.020 in (0.51 mm) total. .40 S&W brass should not be used in a gun chambered for .357 SIG as it can cause damage to the firearm and serious injury or death to the shooter. The cartridge is used by a number of law enforcement agencies and has a good reputation of accuracy.

Developed in 1994, the new cartridge was named "357" to highlight its purpose: to duplicate the performance of 125-grain (8.1 g) .357 Magnum loads fired from 4-inch (100 mm)-barreled revolvers, in a cartridge designed to be used in a semi-automatic pistol with greater ammunition capacity than a revolver. Performance is similar to the 9×23mm Winchester.

Other than specialized competition cartridges like the 9×25mm Dillon (1988), which necked a 10mm Auto case down to a 9mm bullet, the .357 SIG (1994) was the first modern bottleneck commercial handgun cartridge since the early 1960s, when Winchester introduced a .257 caliber round based on the .357 Magnum, the now obsolete .256 Winchester Magnum (1960). Then Remington introduced the unsuccessful .22 Remington Jet (1961), which necked a .357 Magnum case down to a .22 caliber bullet, and the .221 Remington Fireball (1963), a shortened version of their .222 Remington. Soon after the .357 SIG, other bottleneck commercial handgun cartridges appeared: the .400 Corbon (1996), necking the .45 ACP down to .40 caliber; the .440 Corbon (1998), necking down the .50 AE to .44 caliber; the .32 NAA (2002), necking the .380 ACP down to .32 caliber; and the .25 NAA (2004), necking the .32 ACP down to .25 caliber.

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Wikipedia