.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 Two rounds of .357 Magnum, a centerfire cartridge; notice the circular primer in the center A center-fire (or centerfire) is a type of metallic cartridge used in firearms, where the primer is located at the center of the base of its casing (i. ...

cartridges. Cartridges in this caliber include the very widely used .22 Long Rifle and .223 Remington/

5.56×45mm NATO The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, commonly pronounced "five-five-six") is a rimless bottlenecked centerfire intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, ...

. .22 inch is also a popular

air gun An air gun or airgun is a gun that uses energy from compressed air or other gases that are mechanically pressurized and then released to propel and accelerate projectiles, similar to the principle of the primitive blowgun. This is in contr ...

pellet caliber, second only to the ubiquitous .177 caliber.

Rimfire

.22-inch caliber rimfire variations include:

In production

* .22 Long, a cartridge predating the .22 LR, with the same case length using the lighter .22 short bullet * .22 Long Rifle (LR), the most common cartridge type of this caliber, often referred to simply as ".22 caliber" or "22" * .22 Short, a cartridge used mostly in pocket pistols and mini-revolvers * .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 The American-180 is a submachine gun developed in the 1960s which fires the .22 Long Rifle or .22 ILARCO cartridges from a Magazine (firearms)#Pan, pan magazine. The concept began with the Casull Model 290 that used a flat pan magazine similar to ...

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 The Winchester Model 1903 was the first commercially available semi-automatic firearm made by the Winchester Repeating Arms Company. History The Winchester Model 1903 was designed by T.C. Johnson, who had joined Winchester in 1885 and had become ...

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 The Quiet-22 is a .22 caliber round produced by CCI. It has a significantly quieter noise profile compared to most gunshots, generating 75% or less perceived noise than a normal .22. When used with a suppressor A silencer, also known as a ...

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

Centerfire

.22-inch caliber

cartridges include:

Metric

5.56×30mm MINSAS The 5.56×30mm MINSAS is a firearm cartridge manufactured by India's Ordnance Factory Board (OFB) for close-quarters combat Close-quarters battle (CQB), also called close-quarters combat (CQC), is a close combat situation between multiple c ...

, a cartridge for close-quarter battle use *

, an

intermediate cartridge An intermediate cartridge is a rifle/ carbine cartridge that has significantly greater power than a pistol cartridge but still has a reduced muzzle energy compared to fully powered cartridges (such as the .303 British, 7.62×54mmR, 7.65×53 ...

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 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 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 The Savage Model 99, Model 1899, and their predecessor the model 1895 are a series of hammerless lever action rifles created by the Savage Arms Company in Utica, New York. The Model 99 family featured a unique rotary magazine, and later added so ...

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 The Remington XP-100 (from eXperimental Pistol number 100) is a bolt-action pistol produced by Remington Arms from 1963 to 1998. The XP-100 was one of the first handguns designed for long-range shooting and introduced the .221 Remington Fireball, ...

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. re-barreled or lined US 30 Carbines *

.224 Weatherby Magnum The .224 Weatherby Magnum (5.56×49mmB) is a sporting cartridge that Weatherby introduced in 1963. The chambering was discontinued in 1994 and reintroduced in 2025. It is the only belted magnum varmint cartridge. It is a proprietary cartridge ...

(5.56×49mmB), a cartridge developed in 1963 for use in the Weatherby Varmintmaster rifle * .224 Boz, a cartridge developed in the late 1990s, intended to defeat body armor * .224 Valkyrie (5.6×41mm), a cartridge similar to the 5.56×45mm NATO, with a shorter case length * .224-32 FA, a cartridge designed in 2009 for use in the

Freedom Arms Freedom Arms is a Freedom, Idaho and Wyoming, Freedom, Wyoming–based gun manufacturer , firearm manufacturing company, known for producing powerful single-action revolvers. The company was founded in 1978 by Wayne Baker and Dick Casull to pr ...

Model 97 revolver

.225

* .225 Winchester, a replacement for the .220 Swift cartridge, introduced in 1964