I consider that you are wrong.
I have given you the table of shooting for the given guns, I have given you even appearance of this sight in which for B-11 it is possible to see a scale of adjustment of range for shooting on these distances:
www.pecypc.kz/kramax/b10b11/899538.jpg
What for then these tables in general were necessary - there is this gun shoots only on 450 metres? For appearance? 450 metres are a range of a direct shot and it in any way an effective shot are different concepts. At HEAT shells does not decrease penetration with increase in range of shooting. Tanks of those years shoot approximately also the-tipper-of corrects range in a sight.