The .338 caliber member of Remington's Ultra Mag family. Generates more energy than .338 Winchester Magnum and approaches .338 Lapua territory in a hunting-weight rifle. Used for the largest North American game and long-range applications.
Type: Rifle
Introduced: 2002, United States
Parent case: .300 Remington Ultra Magnum
Standardization: SAAMI
Bullet diameter: 0.338" (8.59 mm)
Case length: 2.76" (70.1 mm)
Overall length: 3.6" (91.44 mm)
Max pressure: 65,000 PSI
Rim type: Rebated
Primer: Large Rifle Magnum
Typical twist rate: 1:10
Muzzle velocity: 2700–2950 fps
Muzzle energy: 4084–4863 ft-lbs
Effective range: 600 yd
Common bullet weights: 225, 250, 275 gr
Primary use: Hunting
Production status: Active
Also known as: .338 RUM · .338 Remington Ultra Mag
History: Introduced in 2002 on the same rebated-rim Ultra Mag case as the .300 RUM. The .338 RUM filled the gap between .338 Winchester Magnum and the more exotic .338 Lapua Magnum — offering near-Lapua performance in a platform more accessible to hunters than the Lapua's military-derived bolt actions. Remington chambered the Model 700 in .338 RUM; Federal produced Vital-Shok ammunition. The .338 Lapua's…
Notable firearms: Remington Model 700
Similar cartridges: .338 Lapua Magnum, .338 Winchester Magnum, .338 Norma Magnum