22 caliber, or 5.6mm caliber, refers to a common firearms bore diameter of 0.22 inch (5.6 mm).
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.

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