 .22 Long

.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 grain (1.9 g) bullet and 5 grains (0.32 g) of black powder, 25% more than the .22 Short it was based on.