I'm not an expert, but I've done some reading on the T-34 since it was introduced.
The 85mm gun was a threat to the Tiger frontally at ~1000 yards, according to Russian sources.
The T-34/85 M43 had a 85L52 gun, the later ones had 85L55 guns.. armor penetration was pretty similar.
Depending on which ammo is modelled, the T-34/85 would get around 120 mm of penetration at 100m and a little less than 100mm at 1000m.
With tungsten rounds it'd get ~180mm at 100m.
The T-34/76 gets about 80mm at 100m, and 60mm at 1000m. That is with regular AP though, not Tungsten.