.22 caliber

.22 caliber, or 5.6 mm, refers to a common firearms bore diameter of 0.22 inch (5.6 mm) in both rimfire and centerfire cartridges.

Cartridges in this caliber include the very widely used .22 Long Rifle and .223 Remington/5.56×45mm NATO.

.22 inch is also a popular air gun pellet caliber, second only to the ubiquitous .177 caliber.

Rimfire

.22-inch caliber rimfire variations include:

In production

.22 Short, a cartridge used mostly in pocket pistols and mini-revolvers, introduced in 1857

.22 Long, a cartridge using the same bullet as .22 short but a longer casing, introduced in 1871

.22 Long Rifle (LR), the most common cartridge type of this caliber, often referred to simply as ".22 caliber" or "22"

.22 Stinger, a variant of .22 LR with a slightly longer casing but identical overall cartridge dimensions (see CCI Stinger)

.22 Winchester Magnum Rimfire (WMR), a magnum cartridge that is longer and more powerful than the .22 LR

.22 Winchester Rimfire (WRF), a cartridge originally introduced to provide higher velocity than the .22 LR

Obsolete

.22 Extra Long, a cartridge designed in 1880, not offered commercially since 1935

.22 ILARCO, a cartridge designed in 1987, specific to the American-180 submachine gun

.22 Remington Automatic, a cartridge specific to the Remington Model 16 semi-automatic rifle, not offered commercially since 1928

.22 Winchester Automatic, a cartridge specific to the Winchester Model 1903 semi-automatic rifle, not offered commercially since 1932

Special-use

.22 BB (bulleted breech), a low-velocity cartridge with a case shorter than the .22 short

.22 CB (conical bullet), a low-velocity cartridge with a case shorter than the .22 short

Quiet-22 (40 Grain lead projectile), a low-velocity cartridge with the same case as the .22 LR

Centerfire

.22-inch caliber centerfire cartridges include:

Metric

5.56×30mm MINSAS, a cartridge for close-quarter battle use

5.56×45mm NATO, an intermediate cartridge widely used in AR-15 style rifles

5.7×28mm, a cartridge manufactured by FN Herstal

.22

.22 Accelerator, a special loading of the .30-30 Winchester, .308 Winchester, and .30-06 Springfield cartridges that are manufactured by Remington

.22 ARC

.22 BR Remington, a wildcat cartridge commonly used in varmint hunting and benchrest shooting

.22 CHeetah, a cartridge based on the Remington 308 BR, modified to .22 caliber

.22 Creedmoor

.22 Eargesplitten Loudenboomer, a wildcat cartridge based on a .378 Weatherby Magnum case intended to deliver high muzzle velocity

.22 Hornet (5.6×36mmR), a powerful cartridge variant introduced in 1930

.22 Nosler, a cartridge introduced in 2017 intended for use in AR-15-style rifles

.22 PPC, a firearm cartridge used primarily in benchrest shooting

.22 Remington Jet, a cartridge designed for the Smith & Wesson Model 53 revolver

.22 Savage Hi-Power (5.6×52mmR), a cartridge introduced by Savage in 1912 for use in the Savage Model 99 rifle

.22 TCM (22 Micro-Mag), a shortened .223 Remington case designed to load into standard 9mm pistol magazines

.22 Winchester Centerfire (WCF), a cartridge introduced in 1885 for use in a Winchester single-shot rifle

.22-250 Remington, a very high velocity cartridge

.218

.218 Bee, a cartridge powered between .22 Hornet and .221 Remington Fireball

.220

.220 Rook (.220 Long Centrefire), an obsolete British cartridge of the 1880s

.220 Russian (5.6×39mm), a 7.62×39mm cartridge necked down to hold a 5.6 mm bullet

.220 Swift (5.56×56mmSR), the first cartridge (1935) with a muzzle velocity of over 4,000 ft/s (1,200 m/s)

.221

.221 Remington Fireball, a special cartridge for use in the experimental Remington XP-100 pistol (1963)

.222

.222 Remington, the first commercial rimless .22 (5.56 mm) cartridge made in the United States (1950)

.222 Remington Magnum, a short-lived commercially produced cartridge derived from the .222 Remington

.222 rimmed, an Australian cartridge of the 1960s for single-shot rifles

.223

.223 Remington, a commercial cartridge developed for the ArmaLite AR-15, from which the 5.56×45mm NATO cartridge was derived

.223 Winchester Super Short Magnum (WSSM, 5.56×42mm), a cartridge based on the Winchester Short Magnum case

.224

.22 Spitfire (5.7mm Johnson, originally MMJ 5.7), a cartridge introduced in 1963 for .224 cal.