The T-34 we have in AH looks to be a M1942 with a 76L40 gun, as to what its AP penetration is coded for in the game...I have no idea.
Should do @ 90mm at 500 meters at 0 degrees with a standard APC round.
Im surprised they didnt add something like some tungsten ammo as a perk incentive, just for laughs, say 5 perks for 5 rnds or something.
The 76L11 was a very short gun, doesnt look like that to me from the 3d model, that would be a T-34 M1940.