.22 caliber

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A 22 caliber, or 5.6mm caliber, is a small, extremely common size of ammunition, fitted to firearms with a bore diameter of 0.22 in (5.6 mm). It is the most common bore for rimfire ammunition, and has gained popularity in the air gun discipline as a hunting/field target/HFT pellet caliber.

.22 in caliber rimfire variations include:

.22 inch centerfire cartridges include:

  • 5.56×45mm NATO, an intermediate cartridge widely used in AR-15 style rifles
  • .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, an American centerfire revolver and rifle cartridge
  • .22 BR Remington, a wildcat cartridge commonly used in varmint hunting and benchrest shooting
  • .22 Savage HP, a.k.a. 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
  • .22 TCM (a.k.a. .22 Micro-Mag), a 9mm diameter case necked to a .22 caliber bullet and designed to load into standard 9mm magazines; currently proprietary of Rock Island Armory and accommodating of that company's pistols and carbines also sold with 9mm barrel swap kits.

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