The Hurricane's 40 mm Vickers S guns are very much inferior to the Stuka's 37 mm BK 37. The Vickers' has a muzzle velocity of 1,870 ft/s, or little more than the MK 108 spud gun. The BK clocks in at 3,836 ft/s with APCR Tungsten rounds (standard issue on "Gustav the tank killer"). Almost 1000 ft/s more than the .50 cal. For comparison the Il-2's N-37 clocks in at 2,260 ft/s.