well, how is this:
today I drove up a Tiger behind a Panzer IV and hit him with AP from about 600 right into his six. It took me at least 12 rounds to kill him. I was causing all kinds of damage, he couldnt shoot back, lost tracks (when I switched to HE and hit the edges, as sometimes seems to have better effect than AP) and so on, but still. Most Panzers die with 1 or 2 88mm AP hits to the front, out to 1000 yds.
Only explanation I can think of: The heavy engine block stopped the rounds from inflicting fatal damage. I think I hit the turret, too (disabled it, so I must have) but turret penetration maybe doesnt count as "kill".
Litjan