22 Winchester Magnum Rimfire Rifle Cartridge: The .22 Winchester Magnum Rimfire was introduced in the 1950s by Winchester, and it was the only successful rimfire cartridge introduced in the 20th century as it was quickly chambered in handguns and rifles. The .22 Magnum when chambered in a rifle gives its users many opportunities for a wide selection of ammunition. Hornady … [Read more...] about 22 Magnum Ballistics Charts