Hello Friar!
Would it be possible to make a special map for target practicing and to get to know the gunsight? Using an exact zero-point, where you line up with your tank of choice, and then put up signs with different ranges, like 100m, 200m, up to 1000 meters. I don't know, of course, how to do the signs and so on. I have seen signs on the Quick mission map, but with arrows instead. Maybe use these?
On flat ground of course.
Cheers