Once when I flew 190A-8 with four 20mm armament, I met a zeke low..
I wen't in, already in first pass I had alot hits on the zeke with 20mm and i didnt see any damage.. anyway, it kept flying still.
In next pass, which was head on a like when he turned so quick.. but he had still bad angle to shoot me... I got 4 reaaal close by hits into his left wing, I was sure I nailed him.
but nooo.. he flew and then I was going for third pass when he finally lost wing to my team mates fire (but I got kill)
I swear that was at least 10 20mm hits.. which could have brought any other fighter down from such range where from I shot him.