Floyd, on the M1937, the bar moves up/down the grid and you have to align the grid to the target. All the bar does is give you a grid to aim with. I think the maximum view distance on Berezina is about 300 meters, if that helps you decide what setting to take. I rarely use the range adjustments on anything, tanks included, unless I know it is out over 500 meters and those maps are few. I usually just start chucking rounds by guess and most often hit or are close enough. It is entirely possible that the sights are not "exact", but in the case you note, it sounds like you didn't use the sight correctly.