In my T-34/85 I still get ridiculously long, lob shot, one shot kills, when I can barely see the tank in the sight. Use a dry erase marker on the commanders position and draw a giant "T" with a dot near your ranging shot. Then adjust from there.
T-34/85 sight adjusts out to 3500 yards and still has room to go up in the sight picture.
How ridiculously far out are you shooting?
wrongway