.22 caliber

.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 cartridges.

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