W.J. Jeffery's rimless magazine rifle cartridge for dangerous game. The parent case for many modern magnums including .375 H&H and numerous wildcats.
Type: Rifle
Introduced: 1905, United Kingdom
Parent case: None
Standardization: SAAMI
Bullet diameter: 0.423" (10.74 mm)
Case length: 2.861" (72.67 mm)
Overall length: 3.5" (88.9 mm)
Max pressure: 47,900 PSI
Rim type: Rimless
Primer: Large Rifle Magnum
Typical twist rate: 1:16
Muzzle velocity: 2050–2400 fps
Muzzle energy: 2795–5755 ft-lbs
Effective range: 300 yd
Common bullet weights: 300, 400, 450 gr
Primary use: Dangerous Game, Big Game
Production status: Active
Also known as: .404 Rimless NE · 10.75x73mm
History: Introduced by W.J. Jeffery in 1905 for magazine rifles rather than double rifles. The rimless design fed reliably in bolt-action Mausers. Professional hunters in Africa adopted it widely. Its case dimensions influenced cartridge designers for a century — the .375 H&H, .416 Rigby, and numerous other cartridges all borrowed from the .404 Jeffery's case family.
Notable firearms: Jeffery's Mauser-action rifles, Rigby Highland Stalker, CZ 550 Safari
Similar cartridges: .375 H&H Magnum, .416 Remington Magnum, .416 Rigby