.22 caliber

.22, or .22 caliber, is a small, extremely common size of ammunition, fitted to firearms with a bore diameter of .22 inches. It is the most common bore for rimfire ammunition.

.22 caliber rimfire variations include:

• .22 Long Rifle (LR), the most common variety of .22 caliber ammunition, often referred to simply as ".22 caliber"
• .22 BB (Bulleted Breech Cap)
• .22 CB (Conical Ball Cap)
• .22 CB cap, a .22 in (5.6mm) American rimfire cartridge
• .22 Long, same length, but lighter bullet than .22 LR
• .22 Extra Long, a .22 in (5.6mm) American rimfire rifle and handgun cartridge
• .22 Short, used mostly in pocket pistols and mini-revolvers
• .22 Winchester Rimfire, an American rimfire rifle cartridge
• .22 WMR, (Winchester Magnum Rimfire) a cartridge that is longer and more powerful than a .22 LR
• .22 Winchester Automatic, a .22 in (5.6mm) American rimfire rifle cartridge

.22 caliber centerfire ammunition with "22" in the name:

• .22 Accelerator, a special loading of the .30-30, .308, and .30-06 cartridges that is manufactured by Remington
• .22 Eargesplitten Loudenboomer, a cartridge for a rifle
• .22 Hornet, a powerful variation, also known as 5.6×35R mm 5.728mm
• .22 Remington Jet, a .22 in (5.6mm) American centerfire revolver and rifle cartridge
• .22 BR Remington, a wildcat cartridge commonly used in varmint hunting and benchrest shooting
• .22 Savage HP, aka 5.6×52R, .22 Savage Hi-power, .22 Imp, a cartridge similar to the 22 Hornet introduced by Savage in 1912
• .22 Spitfire, an American rifle cartridge
• .22 PPC, a firearm cartridge used primarily in benchrest shooting

See also

• 22 (number), the natural number following 21 and preceding 23