The .22 WMR, or .22 Winchester Magnum Rimfire, is a type of ammunition designed for small game hunting and target shooting. It was introduced in 1959 and is known for its higher velocity and energy compared to the standard .22 LR (Long Rifle) cartridge. This makes it effective for a variety of small game, such as rabbits and squirrels. The .22 WMR cartridge features a longer case than the .22 LR, allowing for more gunpowder and increased performance. It is commonly used in rifles and revolvers, and its popularity has led to a wide range of firearms designed specifically for this caliber. The Winchester Repeating Arms Company played a significant role in its development.