A major cause of baffling misses on the range and in the field comes when shooters block their own view of the target with their gun. Your muzzle should always be below the line of the target's flight. When you have an unobstructed view of the bird and the gun is in your peripheral vision, it's very simple to focus on the target, see where the muzzle has to go, and put it in the right place. On the other hand, if you hold the gun up in such a way that you block your view of the target even for a moment your eyes will go to the gun, which then stops, causing you to miss over and behind. On crossing and quartering targets, be sure to start your gun below the line of flight.