.307 Winchester

.307 Winchester
Type	Rifle
Place of origin	United States
Production history
Designed	1982
Manufacturer	Winchester
Produced	1982–present
Specifications
Parent case	.308 Winchester
Case type	Rimmed, bottleneck
Bullet diameter	.308 in (7.8 mm)
Neck diameter	.344 in (8.7 mm)
Shoulder diameter	.454 in (11.5 mm)
Base diameter	.471 in (12.0 mm)
Rim diameter	.506 in (12.9 mm)
Rim thickness	.063 in (1.6 mm)
Case length	2.015 in (51.2 mm)
Overall length	2.560 in (65.0 mm)
Maximum CUP	52,000[1] CUP
Ballistic performance
Bullet mass/type Velocity Energy 180 gr (12 g) Super-X Power-Point 2,510 ft/s (770 m/s) 2,519 ft⋅lbf (3,415 J)

The .307 Winchester cartridge was introduced by Winchester in 1982 to meet the demand of .300 Savage performance in a lever-action rifle equipped with a tubular magazine. It is nearly dimensionally identical to the more common .308 Winchester cartridge, the only differences being a rimmed base and thicker case walls.