Personally, I don't see that I was implying the KwK 40 is better here than it was IRL, and that wasn't my intention. Sorry for any misunderstanding
M4A3(76)'s gun. I've gotten hits on tigers' frontal amor at around 1400yds which should be when it can no longer penetrate the tiger's armor, based on the game's charts (115mm at 1k, 97mm at 2k). Since it says "97mm" as opposed to "est. 95mm", then mm's should be able to decide whether the armor is penetrated or not. I've also gotten hits on M4's at 2000yds when it shouldn't have been able to penetrate the frontal amor, assuming the armor IS a bit more than 100mm once you factor in the slope.
Might be just percieved, but it seems like the M4's gun has a bit of leeway.