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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 ...
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. [ 2 ] When introduced, the .22 WRF "was the first notable improvement in the killing power" over the .22 LR, [ 3 ] and was able to kill cleaner at up to 75 yd (69 m).
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).
.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.22 Winchester Rimfire (WRF), a cartridge originally introduced to provide higher velocity than the .22 LR
Model 150 (1967) lever-action .22 rifle (Model 250 variant) Model 190 (1966) semi-automatic .22 rifle; Model 255 (1964) lever-action .22 WMR rifle (Model 250 variant) Model 275 (1964) slide-action .22 WMR rifle (Model 270 variant) Model 310 (1972) single shot .22 rifle; Model 320 (1972) bolt-action .22 rifle 5 or 10 round box magazine
An optional .22 WRF chambering was added in April 1938 to the standard rifle. The same sights used on the Model 68 were offered as options for the Model 67 starting in August 1943. In an effort to render Winchester products more visible when stored vertically on retailers' racks, an inlaid bronze stylized "W" logo was added to the trigger guard ...
The .22 WMR case is a lengthened version of the older .22 WRF. In the most common modern .22 WMR loadings using a 40-grain (2.6 g) bullet, the combination of more powder and higher sustained pressures gives velocities of 1,875 feet per second (572 m/s) from a rifle and 1,500 feet per second (460 m/s) from a handgun.
The Model 1890 will only feed the round specific to that gun (e.g. a Model 1890 stamped ".22 Short" on the barrel will not feed .22 Long, .22 Long Rifle, or .22 WRF; despite there being other 1890s chambered in those calibers). The .22 Long Rifle version was added in 1919. Pistol grip stocks were available on later rifles.