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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9b/22_Long%2C_22_LR%2C_22_Winchester_Magnum.JPG/330px-22_Long%2C_22_LR%2C_22_Winchester_Magnum.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/9/9b/22_Long%2C_22_LR%2C_22_Winchester_Magnum.JPG 2x" data-file-width="400" data-file-height="462" /></a><figcaption></figcaption></figure> <p><b>.22 caliber</b>, or <b>5.6 mm</b>, refers to a common firearms <a href="/wiki/Caliber" title="Caliber">bore diameter</a> of 0.22 inch (5.6 mm) in both <a href="/wiki/Rimfire_ammunition" title="Rimfire ammunition">rimfire</a> and <a href="/wiki/Centerfire" class="mw-redirect" title="Centerfire">centerfire</a> cartridges. </p><p><a href="/wiki/Cartridge_(firearms)" title="Cartridge (firearms)">Cartridges</a> in this caliber include the very widely used <a href="/wiki/.22_Long_Rifle" title=".22 Long Rifle">.22 Long Rifle</a> and <a href="/wiki/.223_Remington" title=".223 Remington">.223 Remington</a>/<a href="/wiki/5.56%C3%9745mm_NATO" title="5.56×45mm NATO">5.56×45mm NATO</a>. </p><p>.22 inch is also a popular <a href="/wiki/Air_gun" title="Air gun">air gun</a> <a href="/wiki/Pellet_(air_gun)" title="Pellet (air gun)">pellet</a> caliber, second only to the ubiquitous <a href="/wiki/.177_caliber" title=".177 caliber">.177 caliber</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Rimfire">Rimfire</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=.22_caliber&action=edit&section=1" title="Edit section: Rimfire"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>.22-inch caliber <a href="/wiki/Rimfire_ammunition" title="Rimfire ammunition">rimfire</a> variations include: </p> <dl><dt>In production</dt></dl> <ul><li><a href="/wiki/.22_Long" title=".22 Long">.22 Long</a>, a cartridge predating the .22 LR, with the same case length using the lighter .22 short bullet</li> <li><a href="/wiki/.22_Long_Rifle" title=".22 Long Rifle">.22 Long Rifle</a> (LR), the most common cartridge type of this caliber, often referred to simply as ".22 caliber" or "22".</li> <li><a href="/w/index.php?title=.22_Long_Rifle_Extra_Long&action=edit&redlink=1" class="new" title=".22 Long Rifle Extra Long (page does not exist)">.22 Long Rifle Extra Long</a> (LR EX), a variant of .22LR with a longer casing but identical overall cartridge dimensions (see <a href="/wiki/CCI_(ammunition)" class="mw-redirect" title="CCI (ammunition)">CCI</a> Stinger)</li> <li><a href="/wiki/.22_Short" title=".22 Short">.22 Short</a>, a cartridge used mostly in pocket pistols and mini-revolvers</li> <li><a href="/wiki/.22_Winchester_Magnum_Rimfire" title=".22 Winchester Magnum Rimfire">.22 Winchester Magnum Rimfire</a> (WMR), a magnum cartridge that is longer and more powerful than the .22 LR</li> <li><a href="/wiki/.22_Winchester_Rimfire" title=".22 Winchester Rimfire">.22 Winchester Rimfire</a> (WRF), a cartridge originally introduced to provide higher velocity than the .22 LR</li></ul> <dl><dt>Obsolete</dt></dl> <ul><li><a href="/wiki/.22_Extra_Long" title=".22 Extra Long">.22 Extra Long</a>, a cartridge predating the .22 LR, not offered commercially since 1935</li> <li><a href="/wiki/.22_Winchester_Automatic" title=".22 Winchester Automatic">.22 Winchester Automatic</a>, a cartridge specific to the <a href="/wiki/Winchester_Model_1903" title="Winchester Model 1903">Winchester Model 1903</a> rifle</li></ul> <dl><dt>Special-use</dt></dl> <ul><li><a href="/wiki/.22_BB" title=".22 BB">.22 BB</a> (Bulleted Breech Cap), a low-velocity cartridge with a case shorter than the 22 short</li> <li><a href="/wiki/.22_CB" title=".22 CB">.22 CB</a> (Conical Bullet Cap), a low-velocity cartridge with a case shorter than the 22 short</li> <li><a href="/w/index.php?title=Quiet-22&action=edit&redlink=1" class="new" title="Quiet-22 (page does not exist)">Quiet-22</a> (40 Grain lead projectile), a low-velocity cartridge with the same case as the .22 LR</li></ul> <div class="mw-heading mw-heading2"><h2 id="Centerfire">Centerfire</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=.22_caliber&action=edit&section=2" title="Edit section: Centerfire"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>.22-inch caliber <a href="/wiki/Centerfire" class="mw-redirect" title="Centerfire">centerfire</a> cartridges include: </p> <dl><dt>Metric</dt></dl> <ul><li><a href="/wiki/5.56%C3%9730mm_MINSAS" title="5.56×30mm MINSAS">5.56×30mm MINSAS</a>, a cartridge for close-quarter battle use</li> <li><a href="/wiki/5.56%C3%9745mm_NATO" title="5.56×45mm NATO">5.56×45mm NATO</a>, an <a href="/wiki/Intermediate_cartridge" title="Intermediate cartridge">intermediate cartridge</a> widely used in <a href="/wiki/AR-15_style_rifle" class="mw-redirect" title="AR-15 style rifle">AR-15 style rifles</a></li> <li><a href="/wiki/5.7%C3%9728mm" class="mw-redirect" title="5.7×28mm">5.7×28mm</a>, a cartridge manufactured by FN Herstal</li></ul> <dl><dt>.22</dt></dl> <ul><li><a href="/wiki/.22_Accelerator" title=".22 Accelerator">.22 Accelerator</a>, a special loading of the .30-30, .308, and .30-06 cartridges that is manufactured by Remington</li> <li><a href="/wiki/.22_BR_Remington" title=".22 BR Remington">.22 BR Remington</a>, a wildcat cartridge commonly used in varmint hunting and benchrest shooting</li> <li><a href="/wiki/.22_CHeetah" title=".22 CHeetah">.22 CHeetah</a>, a cartridge based on the Remington 308 BR, modified to .22 caliber</li> <li><a href="/wiki/.22_Eargesplitten_Loudenboomer" class="mw-redirect" title=".22 Eargesplitten Loudenboomer">.22 Eargesplitten Loudenboomer</a>, a cartridge based on a .378 Weatherby Magnum case intended to deliver high muzzle velocity</li> <li><a href="/wiki/.22_Hornet" title=".22 Hornet">.22 Hornet</a> (5.6×36mmR), a powerful cartridge variant introduced in 1930</li> <li><a href="/wiki/.22_Nosler" class="mw-redirect" title=".22 Nosler">.22 Nosler</a>, a cartridge introduced in 2017 intended for use in AR-15-style rifles</li> <li><a href="/wiki/.22_PPC" title=".22 PPC">.22 PPC</a>, a firearm cartridge used primarily in benchrest shooting</li> <li><a href="/wiki/.22_Remington_Jet" title=".22 Remington Jet">.22 Remington Jet</a>, a cartridge designed for the Smith & Wesson Model 53 revolver</li> <li><a href="/wiki/.22_Savage_Hi-Power" title=".22 Savage Hi-Power">.22 Savage Hi-Power</a> (5.6×52mmR), a cartridge introduced by Savage in 1912 for use in the Savage Model 99 rifle</li> <li><a href="/wiki/.22_TCM" title=".22 TCM">.22 TCM</a> (22 Micro-Mag), a shortened .223 Remington case designed to load into standard 9mm pistol magazines</li> <li><a href="/wiki/.22_Winchester_Centerfire" title=".22 Winchester Centerfire">.22 Winchester Centerfire</a> (WCF), a cartridge introduced in 1885 for use in a Winchester single-shot rifle</li> <li><a href="/wiki/.22-250_Remington" title=".22-250 Remington">.22-250 Remington</a>, a very high velocity cartridge</li></ul> <dl><dt>.218</dt></dl> <ul><li><a href="/wiki/.218_Bee" title=".218 Bee">.218 Bee</a>, a cartridge powered between <a href="/wiki/.22_Hornet" title=".22 Hornet">.22 Hornet</a> and <a href="/wiki/.221_Remington_Fireball" title=".221 Remington Fireball">.221 Remington Fireball</a></li></ul> <dl><dt>.220</dt></dl> <ul><li><a href="/wiki/.220_Rook" title=".220 Rook">.220 Rook</a> (.220 Long Centrefire), an obsolete British cartridge of the 1880s</li> <li><a href="/wiki/.220_Russian" class="mw-redirect" title=".220 Russian">.220 Russian</a> (5.6×39mm), a 7.62×39mm cartridge necked down to hold a 5.6 mm bullet</li> <li><a href="/wiki/.220_Swift" title=".220 Swift">.220 Swift</a> (5.56×56mmSR), the first cartridge (1935) with a muzzle velocity of over 4,000 ft/s (1,200 m/s)</li></ul> <dl><dt>.221</dt></dl> <ul><li><a href="/wiki/.221_Remington_Fireball" title=".221 Remington Fireball">.221 Remington Fireball</a>, a special cartridge for use in the experimental XP-100 pistol (1963)</li></ul> <dl><dt>.222</dt></dl> <ul><li><a href="/wiki/.222_Remington" title=".222 Remington">.222 Remington</a>, the first commercial rimless .22 (5.56 mm) cartridge made in the United States (1950)</li> <li><a href="/wiki/.222_Remington_Magnum" title=".222 Remington Magnum">.222 Remington Magnum</a>, a short-lived commercially produced cartridge derived from the .222 Remington</li> <li><a href="/wiki/.222_Rimmed" title=".222 Rimmed">.222 Rimmed</a>, an Australian cartridge of the 1960s for single-shot rifles</li></ul> <dl><dt>.223</dt></dl> <ul><li><a href="/wiki/.223_Remington" title=".223 Remington">.223 Remington</a>, a commercial cartridge developed for the ArmaLite AR-15, from which the 5.56×45mm NATO cartridge was derived</li> <li><a href="/wiki/.223_Winchester_Super_Short_Magnum" title=".223 Winchester Super Short Magnum">.223 Winchester Super Short Magnum</a> (WSSM, 5.56×42mm), a cartridge based on the Winchester Short Magnum case</li></ul> <dl><dt>.224</dt></dl> <ul><li><a href="/wiki/.22_Spitfire" title=".22 Spitfire">.22 Spitfire</a> (5.7mm Johnson, originally MMJ 5.7), a cartridge introduced in 1963 for .224 cal. re-barreled or lined US 30 Carbines</li> <li><a href="/wiki/.224_Weatherby_Magnum" title=".224 Weatherby Magnum">.224 Weatherby Magnum</a> (5.56×49mmB), a cartridge developed in 1963 for use in the Weatherby Varmintmaster rifle</li> <li><a href="/wiki/.224_Boz" title=".224 Boz">.224 Boz</a>, a cartridge developed in the late 1990s, intended to defeat body armor</li> <li><a href="/wiki/.224_Valkyrie" title=".224 Valkyrie">.224 Valkyrie</a> (5.6×41mm), a cartridge similar to the 5.56×45mm NATO, with a shorter case length</li> <li><a href="/wiki/.224-32_FA" class="mw-redirect" title=".224-32 FA">.224-32 FA</a>, a cartridge designed in 2009 for use in the Freedom Arms Model 97 revolver</li></ul> <dl><dt>.225</dt></dl> <ul><li><a href="/wiki/.225_Winchester" title=".225 Winchester">.225 Winchester</a>, a replacement for the .220 Swift cartridge, introduced in 1964</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=.22_caliber&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/.223_Wylde_chamber" title=".223 Wylde chamber">.223 Wylde chamber</a>, a hybrid rifle chamber designed to allow .22 caliber barrels to safely fire either .223 Remington or 5.56×45mm NATO</li> <li><a href="/wiki/5_mm_caliber" title="5 mm caliber">5 mm caliber</a></li> <li><a href="/wiki/22_(number)" title="22 (number)">22 (number)</a></li> <li><a href="/wiki/Snake_shot" title="Snake shot">Snake shot</a></li> <li><a href="/wiki/22_(disambiguation)" class="mw-redirect mw-disambig" title="22 (disambiguation)">22 (disambiguation)</a></li></ul> <style 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