John Linebaugh's original big-bore revolver cartridge, the direct parent of the .480 Ruger. Fires heavy .476-caliber cast bullets at modest velocity for deep penetration on dangerous game. Requires custom single-action revolvers.
Type: Revolver
Introduced: 1988, United States
Parent case: .45-70 Government (modified)
Standardization: None
Bullet diameter: 0.476" (12.09 mm)
Case length: 1.5" (38.1 mm)
Max pressure: 25,000 PSI
Rim type: Rimmed
Primer: Large Pistol
Typical twist rate: 1:24
Muzzle velocity: 1250–1450 fps
Muzzle energy: 1281–2051 ft-lbs
Effective range: 75 yd
Common bullet weights: 370, 400, 440 gr
Primary use: Hunting
Production status: Active
Also known as: 12.1x35mmR
History: Developed by John Linebaugh in 1988 for wilderness and African dangerous-game hunting from a revolver. The .475 Linebaugh requires custom five-shot revolvers — typically single-action conversions of Ruger Super Blackhawks — as no production revolvers originally chambered it. Ruger and Hornady's response was the .480 Ruger (2003), a lower-pressure version for production revolvers. Buffalo Bore and…
Notable firearms: Custom Ruger Super Blackhawk conversions, Freedom Arms Model 83
Similar cartridges: .480 Ruger, .500 Linebaugh, .454 Casull