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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 ...
The original Federal Cartridge and Machine Company was founded during the period of increased ammo demand during the First World War, when brothers Harry and Louis Sherman, experienced in the industry, found investors to establish a small plant on the eastern outskirts of Anoka, Minnesota to make shotgun shells.
The most common rimfire cartridges are chambered for .17 caliber and .22 caliber. The bullet diameter for .17 caliber firearms generally measure .172 inch (4.37 mm), while the bullet diameter for .22 caliber firearms generally measure .222 inch (5.64 mm).
Introduced in the Winchester M1890 slide rifle, it had a flat-nose slug, and is identical to the .22 Remington Special (which differed only in having a roundnosed slug). [2] It uses a flat-based, inside-lubricated bullet, which differs from the outside-lube heeled bullet of the .22 Short, .22 Long, .22 Long Rifle, and .22 Extra Long cartridges.
It combined the casing of the .22 Long with the 40-grain (2.6 g) bullet of the .22 Extra Long, giving it a longer overall length, a higher muzzle velocity, and superior performance as a hunting and target round, rendering the .22 Short, .22 Long, and .22 Extra Long cartridges obsolete.
.22 Long Rifle Extra Long (LR EX), a variant of .22LR with a longer casing but identical overall cartridge dimensions (see CCI Stinger).22 Short, a cartridge used mostly in pocket pistols and mini-revolvers.22 Winchester Magnum Rimfire (WMR), a magnum cartridge that is longer and more powerful than the .22 LR
Standard barrel lengths are 20" in the 10/22 Rifle, 18 1 ⁄ 2" in the 10/22 Carbine, and 16 1 ⁄ 8" in the 10/22 Compact Rifle which is also fitted with a shorter stock. All .22 Long Rifle versions use an aluminum receiver, while the discontinued .22 Magnum version used a steel receiver with integral scope bases.
[10] [11] A 1.87-inch (47 mm) barrel version of the LCRx in .357 Magnum and a 3-inch (76 mm) barrel version in .22 Magnum and .22 LR became available in April 2017. The 1.87-inch barrel version became available as a five-shot 9mm Luger and a six-shot .327 Federal Magnum in the fall of 2017.