.300 Winchester Short Magnum

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300 Winchester Short Magnum
From left to right: .300 Winchester Magnum, 300 WSM, .308 Winchester, .223 Remington
Type	Rifle
Place of origin	United States
Production history
Designer	Winchester
Designed	2001
Manufacturer	Winchester
Produced	2001–present
Specifications
Case type	Rebated-rimmed, bottleneck
Bullet diameter	.308 in (7.8 mm)
Land diameter	.300 in (7.6 mm)
Neck diameter	.344 in (8.7 mm)
Shoulder diameter	.538 in (13.7 mm)
Base diameter	.555 in (14.1 mm)
Rim diameter	.535 in (13.6 mm)
Case length	2.100 in (53.3 mm)
Overall length	2.860 in (72.6 mm)
Case capacity	80.4 gr
Rifling twist	1-10"
Primer type	Large rifle magnum
Maximum pressure (C.I.P.)	63,817 psi (440.00 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 150 gr (10 g) SP 3,313 ft/s (1,010 m/s) 3,657 ft⋅lbf (4,958 J) 165 gr (11 g) HP 3,223 ft/s (982 m/s) 3,807 ft⋅lbf (5,162 J) 180 gr (12 g) HP 3,095 ft/s (943 m/s) 3,830 ft⋅lbf (5,190 J) 200 gr (13 g) SP 2,822 ft/s (860 m/s) 3,538 ft⋅lbf (4,797 J)
Test barrel length: 24" Source(s): Reloading data at Accurate Powder

300 Winchester Short Magnum (also known as 300 WSM) is a .30 caliber rebated rim bottlenecked centerfire short magnum cartridge that was introduced in 2001 by Winchester.^[1]