Nevertheless, if you can shoot with both eyes open, you should. Shooting one-eyed makes you over-aware of the gun. Two-eyed shooters see the gun as an insubstantial blur; one eyed shooters see the gun in sharp focus. The better you see it, the more likely you are to aim it, and aiming is the worst way to shoot a shotgun. Your eye-to-hand coordination and subconscious mind are much more effective at putting a gun on target than your conscious, aiming mind can ever be.