.22 extra long
The .22 extra long is a .22 in (5.6 mm) American rimfire rifle and handgun cartridge. == Background == Introduced in 1880, the .22 extra long was used in Remington, Ballard, Wesson, Stevens, and later (1916) models of Winchester's M1902 and M1904 single-shot bolt-action rifles, as well as in Smith & Wesson revolvers.