What are the calibers of artillery?

20 (machine gun), 25 (machine gun), 30 (machine gun), 35 (machine gun), 37 (antiaircraft gun), 40 (antiaircraft gun), 45 (antiaircraft gun), 47 (antiaircraft gun), 50 (grenade barrel, Note: Grenade launchers are mortars), 57 (anti-tank guns), 60 (mortars), 75 (anti-tank guns, recoilless guns and howitzers), 76 (anti-tank guns and anti-aircraft guns), 8 1 (mortars), 82 (mortars 130 (mortars). 55 (howitzer), 160 (heavy mortar), 180 (World War II) 300 (rocket, naval gun), 350 (naval gun), 380 (naval gun), 406 (naval gun), 460 (naval gun), 800. (The answer to the broken beetle bomb)