It has to do with confidence at reasonable hunting distances. Certainly I would not feel comfortable at 40 yards but I do practice at that and further ranges and find it helps confidence immensely at shorter actual distances. That said, when a critter comes along that I want to shoot, yardage is never considered. My pea brain could not hold that information when I really need to concentrate on the spot I want to hit and if the animal is walking, quartering, etc. When it is time to shoot, you got to take the shot that you can make. Love it when they are close though!