.22 Winchester Magnum | ||||||||||||||||
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![]() .22 Winchester Magnum Rimfire | ||||||||||||||||
Type | Rifle | |||||||||||||||
Place of origin | United States | |||||||||||||||
Production history | ||||||||||||||||
Designed | 1959 | |||||||||||||||
Manufacturer | Winchester | |||||||||||||||
Produced | 1959–present | |||||||||||||||
Specifications | ||||||||||||||||
Parent case | .22 Winchester Rimfire | |||||||||||||||
Case type | Rimmed, straight | |||||||||||||||
Bullet diameter | .224 in (5.804 mm) | |||||||||||||||
Land diameter | .219 in (5.6 mm) | |||||||||||||||
Neck diameter | .2435 in (6.185 mm) | |||||||||||||||
Base diameter | .2455 in (6.236 mm) | |||||||||||||||
Rim diameter | .300 in (7.62 mm) | |||||||||||||||
Rim thickness | .050 in (1.27 mm) | |||||||||||||||
Case length | 1.055 in (26.8 mm) | |||||||||||||||
Overall length | 1.350 in (34.3 mm) | |||||||||||||||
Rifling twist | 1-16" | |||||||||||||||
Primer type | Rimfire | |||||||||||||||
Maximum pressure | 24,000 psi (170 MPa) | |||||||||||||||
Ballistic performance | ||||||||||||||||
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Test barrel length: 24 inches (610 mm) Source(s): Cartridges of the World[1] |
The .22 Winchester Magnum Rimfire, also known as the .22 WMR, .22 Magnum, .22 WMRF, .22 MRF,[2] or .22 Mag, is a rimfire cartridge. Originally loaded with a bullet weight of 40 grains (2.6 g) delivering velocities in the 2,000 feet per second (610 m/s) range from a rifle barrel, .22 WMR is now loaded with bullet weights ranging from 50 grains (3.2 g) at 1,530 feet per second (470 m/s) to 30 grains (1.9 g) at 2,200 feet per second (670 m/s).[3][4]
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