with the 20's on the La's, it takes me (on a good day) about 10 to 20 shots to down any fighter, and in the Il2 it takes me about 20 to 30 shots with the 37mm's to take out anything but a tiger, I dont know how much ammo the 163 gets, but if its over 100 then it should be way more then enough to take out any buff's