.300 Winchester Short Magnum

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.

300 Winchester Short Magnum
From left to right: .300 Winchester Magnum, 300 WSM, .308 Winchester, .223 Remington
TypeRifle
Place of originUnited States
Production history
DesignerWinchester
Designed2001
ManufacturerWinchester
Produced2001–present
Specifications
Case typeRebated-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 length2.100 in (53.3 mm)
Overall length2.860 in (72.6 mm)
Case capacity80.4 gr
Rifling twist1-10"
Primer typeLarge 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
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