.357 Magnum

.357 Magnum
.357 Magnum ammunition
Type	Handgun, Carbine
Place of origin	United States
Production history
Designer	Elmer Keith Phillip B. Sharpe Douglas B. Wesson
Designed	1934
Manufacturer	Smith & Wesson Winchester
Produced	1935–present
Specifications
Parent case	.38 Special
Case type	Rimmed, straight
Bullet diameter	.357 in (9.1 mm)
Land diameter	.346 in (8.8 mm)
Neck diameter	.379 in (9.6 mm)
Base diameter	.379 in (9.6 mm)
Rim diameter	.440 in (11.2 mm)
Rim thickness	.060 in (1.5 mm)
Case length	1.29 in (33 mm)
Overall length	1.59 in (40 mm)
Case capacity	26.2 gr H2O (1.70 cm3)
Primer type	Small pistol magnum
Maximum pressure (CIP)	44,000 psi (300 MPa)
Maximum pressure (SAAMI)	35,000 psi (240 MPa)
Maximum CUP	45,000 CUP
Ballistic performance
Bullet mass/type Velocity Energy 125 gr (8 g) JHP Federal 1,450 ft/s (440 m/s) 583 ft⋅lbf (790 J) 158 gr (10 g) JHP Federal 1,240 ft/s (380 m/s) 539 ft⋅lbf (731 J) 180 gr (12 g) HC Buffalo Bore 1,400 ft/s (430 m/s) 783 ft⋅lbf (1,062 J) 200 gr (13 g) Double Tap 1,200 ft/s (370 m/s) 640 ft⋅lbf (870 J)
Test barrel length: 4 in (102 mm) (vented) Source(s): Federal,[1]

The .357 Smith & Wesson Magnum, .357 S&W Magnum, .357 Magnum, or 9×33mmR (as it is known in unofficial metric designation) is a smokeless powder cartridge with a 0.357 in (9.07 mm) bullet diameter. It was created by Elmer Keith, Phillip B. Sharpe,^[2] and Douglas B. Wesson^[2][3] of firearm manufacturers Smith & Wesson and Winchester.^[4][5] The .357 Magnum cartridge is notable for its highly effective terminal ballistics.

The .357 Magnum cartridge is based upon Smith & Wesson's earlier .38 Special cartridge. It was introduced in 1935, and its use has since become widespread.^[6]