Near-.300 Win Mag performance from a short-action rifle. Among the most commercially successful WSM cartridges.
Type: Rifle
Introduced: 2001, United States
Parent case: .404 Jeffery
Standardization: SAAMI
Bullet diameter: 0.308" (7.82 mm)
Case length: 2.1" (53.34 mm)
Overall length: 2.86" (72.64 mm)
Max pressure: 65,000 PSI
Rim type: Rebated
Primer: Large Rifle Magnum
Typical twist rate: 1:10
Muzzle velocity: 2850–3300 fps
Muzzle energy: 2700–3500 ft-lbs
Effective range: 600 yd
Common bullet weights: 150, 165, 180, 200 gr
Primary use: Hunting, Long Range
Production status: Active
Also known as: .300 Winchester Short Magnum
History: Introduced by Winchester in 2001 as the first WSM. Achieves approximately 95% of .300 Win Mag velocity in a short action. Adopted for some precision rifle applications.
Notable firearms: Winchester Model 70, Browning X-Bolt, Savage Model 116
Similar cartridges: .300 Winchester Magnum, .300 PRC, .308 Winchester