Well, I corralled a fella (Redwolf, and a big <S> out to ya man
) into helping me with my "study". We were both tired though, so we didn't get past the initial ten test run, which was 190A8 vs B17 (tail guns only). As a note, on the first run where I took 30 hits, I did NOT die. I flew past B17. I lost the engine, suffered a whole pile of damage, but the plane was still flyable. On 9 of the 10 attacks, the engine went about halfway through the "burst" I took (he was firing really short bursts to make sure every round hit, I'd lose the engine about halfway through, then lose a wing [7 of 10] or the tail [2 of 10].
Anyway, here is what we came up with for the results. These results were obtained by flying a 190A8 straight and level behind a B17 while the B17 fired only its tailguns. We obtained the number of rounds fired by checking the ammunition counter before and after every kill. He did miss with 1 or 2 rounds on perhaps half of the kills he said.
He started firing when I crossed d500- that may skew the results, we'll have to try different ranges.
26,29,27,22,32,30*,26,30,15,18.
Works out to an average of 22.5 .50 caliber rounds hitting to kill a 190A8, the "armored" "buff-killer" 190. That number is actually shockingly low to me, it usually sounds like more hits than that.