23 mm caliber

23 mm caliber is a specific size of cannon or autocannon ammunition.

This ammunition size has not been widely used. Examples of armaments using it are:
 * 23×115mm caliber, used on many Soviet and Russian airplanes
 * 23×122mm
 * 23×139mmSR
 * 23×152mm caliber, used on Ilyushin Il-2 attack plane as well as on later Soviet anti-aircraft guns