.22 long

Common card · No. 370255

The .22 long is a variety of .22 caliber (5.6 mm) rimfire ammunition. The .22 long is the second-oldest of the surviving rimfire cartridges, dating back to 1871, when it was loaded with a 29 gr (1.9 g) bullet and 5 gr (0.32 g) of black powder, 25% more than the .22 short on which it was based. It was designed for use in revolvers, but was soon chambered in rifles as well, in which it gained a reputation as a small game cartridge. In 1887, the .22 long case was combined with the heavier 40 gr (2.6 g) bullet of the .22 extra long of 1880 to produce the .22 long rifle, giving a longer overall length and a higher muzzle energy. Many firearms designed for the .22 long rifle will chamber and fire the shorter round, though the .22 long generally does not generate sufficient energy to operate semi-automatic guns. The one prominent survivor of the .22 long is the .22 CB long, a long-cased version of the .22 CB. The original .22 long loading used the same powder charge as the .22 long rifle, .22...

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