SOCOM's heavy option in the Mk 22 ASR system. Delivers .338 Lapua-class performance with better fit in standard-sized magazine-fed actions.
Type: Rifle
Introduced: 2009, Sweden
Parent case: .338 Lapua Magnum
Standardization: SAAMI
Bullet diameter: 0.338" (8.59 mm)
Case length: 2.394" (60.8 mm)
Overall length: 3.681" (93.5 mm)
Max pressure: 65,000 PSI
Rim type: Rimless
Primer: Large Rifle Magnum
Typical twist rate: 1:9.4
Muzzle velocity: 2600–2900 fps
Muzzle energy: 4000–5600 ft-lbs
Effective range: 1500 yd
Common bullet weights: 250, 270, 300 gr
Primary use: Long Range, Military, Anti-Materiel
Production status: Active
Also known as: .338 NM
History: Introduced by Norma in 2009. Selected by SOCOM for the Mk 22 alongside .300 Norma and .300 PRC. Uses .338 Lapua bullets in a shorter case, optimized for the highest BC projectiles available.
Notable firearms: Barrett MRAD Mk22, Accuracy International AXMC
Military use: {"country":"USSOCOM","years":""}
Similar cartridges: .338 Lapua Magnum, .300 Norma Magnum