Improved .280 Remington with more powder capacity. Approaches 7mm Rem Mag performance without magnum recoil or barrel wear. Finally SAAMI standardized by Nosler.
Type: Rifle
Introduced: 1960, United States
Parent case: .280 Remington
Standardization: SAAMI
Bullet diameter: 0.284" (7.21 mm)
Case length: 2.54" (64.52 mm)
Overall length: 3.33" (84.58 mm)
Max pressure: 63,000 PSI
Rim type: Rimless
Primer: Large Rifle
Typical twist rate: 1:8.5 to 1:9
Muzzle velocity: 2900–3100 fps
Muzzle energy: 2950–3300 ft-lbs
Effective range: 700 yd
Common bullet weights: 140, 150, 160, 168 gr
Primary use: Hunting, Target
Production status: Active
Also known as: .280 AI · .280 Rem AI
History: Created by legendary wildcatter P.O. Ackley by fire-forming .280 Remington brass to 40-degree shoulder with less body taper. Increases powder capacity by ~6%. Wildcat for 45+ years until Nosler commercialized it in 2007 and achieved SAAMI standardization. Provides 7mm Rem Mag ballistics with standard-length action and less powder. Growing in popularity.
Notable firearms: Nosler M48, Kimber 8400, Montana Rifle Company, Custom rifles
Similar cartridges: .280 Remington, 7mm Remington Magnum, .270 Winchester