Winchester's 8mm entry in the Short Magnum family — a powerful, compact round delivering near-.338 Win Mag performance in a short-action cartridge. Less popular than the .300 and .270 WSM siblings but still commercially active.
Type: Rifle
Introduced: 2005, United States
Parent case: .300 WSM (expanded)
Standardization: SAAMI
Bullet diameter: 0.323" (8.2 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
Typical twist rate: 1:10
Muzzle velocity: 2840–3060 fps
Muzzle energy: 3224–4561 ft-lbs
Effective range: 400 yd
Common bullet weights: 180, 200, 220 gr
Primary use: Hunting
Production status: Active
Also known as: .325 Winchester Short Magnum · 8mm WSM · 8.2x53mm
History: Introduced in 2005 as the last addition to Winchester's WSM family. The .325 WSM was designed to give hunters .338-class performance in a short-action rifle. Factory ammunition from Winchester and Nosler remains available, though selection is limited compared to more popular WSM cartridges. The Winchester Model 70 is the primary platform.
Notable firearms: Winchester Model 70, Browning X-Bolt
Similar cartridges: 8mm Remington Magnum, .300 Winchester Magnum, .338 Winchester Magnum