My only possible experience was when, as a relatively new hunter, I forgot about the 1.5" difference between scope height and muzzle exit. Walking a little 2 track in PA, I saw a doe about 40-50 yards uphill, unaware of me. Instead of firing offhand, and figuring the deer didn't know I was there, I took a knee for a shot. Of course, there was some small brush between the wheel tracks and as I was in the far one from the deer I was behind them. Needless to say, no hit on the deer. Shot sure looked clear in the scope.
Geno