The original ultra-fast 7mm magnum — a long-case belted design pushing 140-grain bullets past 3,300 fps. The 'speed freak' cartridge of its era.
Type: Rifle
Introduced: 1979, United States
Parent case: 8mm Remington Magnum
Standardization: SAAMI
Bullet diameter: 0.284" (7.21 mm)
Case length: 2.85" (72.39 mm)
Overall length: 3.6" (91.44 mm)
Max pressure: 65,000 PSI
Rim type: Belted
Primer: Large Rifle Magnum
Typical twist rate: 1:9
Muzzle velocity: 3000–3400 fps
Muzzle energy: 2799–3584 ft-lbs
Effective range: 600 yd
Common bullet weights: 140, 150, 160, 175 gr
Primary use: Hunting, Target
Production status: Active
Also known as: 7mm Shooting Times Westerner · 7 STW
History: Developed in 1979 by Layne Simpson, firearms editor at Shooting Times magazine, by necking down the 8mm Remington Magnum case to 7mm. Simpson nicknamed it the Shooting Times Westerner. It remained a wildcat for nearly two decades before Remington standardized it and began producing ammunition in 1996. At its introduction, it was the fastest production 7mm cartridge available, offering velocities…
Notable firearms: Remington Model 700, Weatherby Mark V, Sako 85
Similar cartridges: 7mm Rem Mag, .28 Nosler, 7mm PRC, 7mm Wby Mag