Insane damage without ammo rack

lammaer, on 19 March 2011 - 04:51 PM, said: Question1: is it intended - or even remotely possible - that one IS4 can oneshot another IS4 from 100% WITHOUT ammo rack?
As we currently know, an AP ammo damage vary from the average by +-20% (or 25%?).
So in theory the 130mm S-70 gun (average damage: AP - 490) may damage between 392 - 588. As the base IS4 HP is 1590 HP, I can hardly imagine one shot kill apart from the ammo rack - however, a friend of mine claimed, in a battle where he encountered and IS4 1vs1, the opposite IS4 oneshotted him from 100%.
Since that was the last enemy tank, that had to be one shot and the ammo rack message was not displayed for him.
Question2: apart from the ammo rack, may it possible to damage more than the theoretical maximum (average damage + 20%) of the given gun? Eg will another module hit increase the raw shell damage?