I tested the 75mm gun against the T-34 offline. I set damage same as the MAs.
It's rather important where you hit the T-34. Turret hits are not very productive. A single side hit in the area of the driver can kill it, as the film linked below shows.
Aside from where you hit it, getting as close as possible helps. Why? Muzzle velocity. The longer the distance, the lower the velocity of the round.
Note the speeds and trim setting, both important to avoid striking trees, ground or buildings.
Here's the
short film. My regards,
Widewing