Adopted by SOCOM for the Advanced Sniper Rifle. Bridges the gap between .300 Win Mag and .338 Lapua in long-range precision.
Type: Rifle
Introduced: 2012, Sweden
Parent case: .338 Lapua Magnum
Standardization: SAAMI
Bullet diameter: 0.308" (7.82 mm)
Case length: 2.494" (63.35 mm)
Overall length: 3.681" (93.5 mm)
Max pressure: 65,000 PSI
Rim type: Rimless
Primer: Large Rifle Magnum
Typical twist rate: 1:9
Muzzle velocity: 2800–3100 fps
Muzzle energy: 3750–4900 ft-lbs
Effective range: 1200 yd
Common bullet weights: 215, 230, 250 gr
Primary use: Long Range, Military, Competition
Production status: Active
Also known as: .300 NM · .300 Norma
History: Introduced by Norma in 2012. Selected by U.S. SOCOM for the Mk 22 Advanced Sniper Rifle System in 2019, alongside .300 PRC and .338 Norma Magnum. Provides extreme long-range capability with manageable recoil compared to .338 Lapua.
Notable firearms: Barrett MRAD Mk22, Accuracy International AXMC
Military use: {"country":"U.S. Special Operations Command","years":"SOCOM"}
Similar cartridges: .338 Lapua Magnum, .300 PRC, .300 Win Mag