I agree that you could tell if it was over or under whatever distance your pin gap covered but the BIG QUESTION is how much over or under ? You can do the same with your binos, if they are focused on say a 35 yard shot and you have to refocus them for the next shot you know if it is closer or farther, but how much ? I am not doubting that some of this goes on but I think you could get so wrapped up in zeroing in on yardage that you may lose concentration on the shot itself.