23 mm caliber

23 mm caliber is a specific size of popular autocannon ammunition.

This ammunition size has been widely used in many conflicts worldwide. Examples of armaments using it are:
 * 23×115mm caliber, used on many Soviet and Russian airplanes
 * 23×122mm
 * 23×139mmSR
 * 23×152mmB caliber, used on Ilyushin Il-2 attack plane as well as on later Soviet anti-aircraft guns
 * 23×260mm caliber, telescoped ammunition used on the Rikhter R-23 autocannon