Long-range AR-15 cartridge. Better ballistics than 5.56 NATO. Works in standard AR-15 lower. Popular for PRS and hunting.
Type: Rifle
Introduced: 2003, United States
Parent case: .220 Russian
Standardization: SAAMI
Bullet diameter: 0.264" (6.71 mm)
Case length: 1.52" (38.61 mm)
Overall length: 2.26" (57.4 mm)
Max pressure: 52,000 PSI
Rim type: Rebated
Primer: Small Rifle
Typical twist rate: 1:8
Muzzle velocity: 2400–2700 fps
Muzzle energy: 1200–1600 ft-lbs
Effective range: 800 yd
Common bullet weights: 90, 100, 120, 123, 130 gr
Primary use: Target, Hunting, Competition
Production status: Active
Also known as: 6.5mm Grendel
History: Developed 2003 by Bill Alexander and Arne Brennan as long-range AR-15 option. Uses 7.62x39mm bolt face. Inspired later developments like 6mm ARC.
Notable firearms: AR-15, Alexander Arms rifles, Howa Mini Action
Similar cartridges: 6.5 Creedmoor, 6mm ARC