.375 Winchester

The .375 Winchester is a modernized version of the .38-55 Winchester, a black powder cartridge from the 1880s. It was introduced in 1978 along with the Winchester Model 94 “Big Bore” lever action rifle.

.375 Winchester
Photo of two .375 Winchester rifle cartridges with others for comparison. Left to right: 8mm Mauser, .308 Winchester, .375 Winchester, .22 Long Rifle. Foreground: .375 Winchester.
Type	Rifle
Place of origin	USA
Production history
Manufacturer	Winchester
Produced	1978
Specifications
Parent case	.38-55 Winchester
Bullet diameter	.375 in (9.5 mm)
Neck diameter	.400 in (10.2 mm)
Base diameter	.420 in (10.7 mm)
Rim diameter	.506 in (12.9 mm)
Rim thickness	.063 in (1.6 mm)
Case length	2.020 in (51.3 mm)
Overall length	2.560 in (65.0 mm)
Ballistic performance
Bullet mass/type Velocity Energy 200 gr (13 g) JFP 2,223 ft/s (678 m/s) 2,194.12 ft⋅lbf (2,974.83 J) 200 gr (13 g) JFP 2,419 ft/s (737 m/s) 2,598.09 ft⋅lbf (3,522.54 J) 220 gr (14 g) JFP 2,029 ft/s (618 m/s) 2,010.66 ft⋅lbf (2,726.09 J) 220 gr (14 g) JFP 2,236 ft/s (682 m/s) 2,441.85 ft⋅lbf (3,310.70 J)
Source(s): Hodgdon Online Reloading Data

Though very similar in appearance to the parent .38-55, the .375 has a shorter case length and operates at much higher pressures (50,000 CUP).