There is a reason we have a tendency to shoot pheasants in the butt, but it has nothing to do with the velocity of your shells. The human eye has the tendency to focus on the center of anything that it see when it is crossing or going away at a slight angle. (If you have ever mountain biked rough trails you already know that if you focus on the tree, you will hit the tree) The center of a rooster pheasant with a long tail on a crossing shot is his butt. I've been shooting roosters for 50 years and I still do that if I am startled. Concentrate on looking at the white collar around his neck and you will kill more birds.