The 30 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm, the Soviet 30×155mmB, 30×165mm and 30×210mmB, the Czechoslovak 30×210mm, the Yugoslav 30×192mm, the British 30×113mmB, and the French 30×150mmB and 30×170mm cartridges.
Size comparison between 30×170mm and 5.56x45mm NATO
Soviet 30×165mm
The DU penetrator of a 30×173 mm round used in the GAU-8
French 30×150mmB
The AK-630 is a Soviet and Russian fully automatic naval, rotary cannon, close-in weapon system. The "630" designation refers to the weapon's six gun barrels and their 30 mm caliber.
One of two AK-630M installations on the former East-German ship Hiddensee
MR-123 fire-control radar on the Soviet aircraft carrier Minsk
Coastal based AK-630 of Indian Navy during firing drill
AK-306 in front of AK-630M