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.22, or "22 caliber", is a small, extremely common size of 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 Long - same length, but lighter bullet than .22 LR
• .22 Short - used mostly in pocket pistols and mini-revolvers
• .22 WMR - (Winchester Magnum Rimfire) a cartridge that is larger and generally more powerful than a .22 LR

Ammunition using .22 caliber slugs, but larger diameter, centerfire casings:

• .22 Hornet - a powerful variation, also known as 5.6x35R mm
• .22 Reed Express - another name for 7.62x25mm

See also

• 22 (number)

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