yeah usually in a good sortie its 10%. in a bad one it goes down to 2%.
but 10%+ is a very high rating. i once had something like 15 % and got home with no bullets in a FW. it was not in vain as i did destroy 4 La5, 2 il2 and 1 A20.
thats my personnal record.
the top accuaracy ive had was 60% in a 109, but htat one count as cheeting. it was a half a second burst in a scissor pass ehre he apssed 5 meters from me. so out of 20 bullets i hit something like 14.