The 7mm option in Winchester's short magnum family. Matches 7mm Rem Mag performance from a shorter, stiffer action that some argue improves accuracy.
Type: Rifle
Introduced: 2001, United States
Parent case: .404 Jeffery
Standardization: SAAMI
Bullet diameter: 0.284" (7.21 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: 1:9.5
Muzzle velocity: 3000–3250 fps
Muzzle energy: 2799–3666 ft-lbs
Effective range: 600 yd
Common bullet weights: 140, 150, 160, 175 gr
Primary use: Hunting, Long Range
Production status: Active
Also known as: 7mm Winchester Short Magnum
History: Part of Winchester's early 2000s WSM initiative. Offers 7mm Rem Mag performance in a short-action rifle. The short, fat case theory held that a stubby case with a large powder column burned more consistently than a long, slender case — resulting in better standard deviations and accuracy.
Notable firearms: Winchester Model 70 Short Action, Browning X-Bolt
Similar cartridges: 7mm Remington Magnum, 7mm PRC, .270 WSM