The most versatile dangerous-game cartridge available in standard-length actions. Suitable for elk through elephant at close range.
Type: Rifle
Introduced: 1958, United States
Parent case: .375 H&H Magnum
Standardization: SAAMI
Bullet diameter: 0.338" (8.59 mm)
Case length: 2.5" (63.5 mm)
Overall length: 3.34" (84.84 mm)
Max pressure: 64,000 PSI
Rim type: Belted
Primer: Large Rifle Magnum
Typical twist rate: 1:10
Muzzle velocity: 2400–2900 fps
Muzzle energy: 2560–4000 ft-lbs
Effective range: 600 yd
Common bullet weights: 200, 225, 250, 275, 300 gr
Primary use: Hunting, Big Game, Long Range
Production status: Active
Also known as: .338 Win Mag
History: Introduced by Winchester in 1958 on the .375 H&H case. Immediately became the premium American big-game cartridge. Jack O'Connor and Elmer Keith debated it — O'Connor preferred his 7mm; Keith thought it perfect for heavy game.
Notable firearms: Winchester Model 70, Ruger M77, Browning BAR
Similar cartridges: .340 Weatherby Magnum, .338 Lapua Magnum, .375 H&H Magnum