The .22 Winchester Magnum Rimfire (often abbreviated as .22 WMR) is a type of rimfire cartridge designed for small game hunting and target shooting. Introduced in 1959, it features a larger case and a more powerful load than the standard .22 Long Rifle cartridge, providing increased velocity and energy. This makes it suitable for a variety of applications, including varmint control and recreational shooting. The .22 WMR typically fires a bullet weighing between 30 to 50 grains, with a muzzle velocity that can exceed 2,000 feet per second. Its popularity stems from its effectiveness and versatility, making it a favored choice among hunters and sport shooters alike. The cartridge is compatible with a range of firearms, including rifles and revolvers specifically designed for it.