Large-bore black-powder Winchester Model 1886 cartridge. One of several heavy calibers offered for the 1886 to give hunters maximum power in a repeating rifle during the transition era from single-shots to repeaters.
Type: Rifle
Introduced: 1887, United States
Parent case: .45-70 Government
Standardization: None
Bullet diameter: 0.406" (10.31 mm)
Case length: 2.1" (53.34 mm)
Max pressure: 18,000 PSI
Rim type: Rimmed
Primer: Large Rifle
Typical twist rate: 1:18
Muzzle velocity: 1380–1500 fps
Muzzle energy: 1100–1299 ft-lbs
Effective range: 200 yd
Common bullet weights: 260 gr
Primary use: Hunting
Production status: Discontinued
Also known as: .40-65 WCF · 10.2x52mmR
History: Introduced in 1887 for the Model 1886, the .40-65 WCF was one of the more popular large-bore options in Winchester's catalog of the late 19th century. It offered a balance of power and case capacity for large North American game. Factory ammunition was discontinued by the early 20th century. Cast-bullet handloading from formed brass keeps the cartridge alive among Model 1886 collectors.
Notable firearms: Winchester Model 1886
Similar cartridges: .38-56 Winchester, .45-70 Government, .40-82 Winchester