I think that's it. A shotgun only has a bead, so you don't have a pair of sights to align and you never take your eyes off the target. When I shot bowling pins, I was almost always the first gun to fire and if I happened to knock five pins off the table with 5 shots, I'd shoot #6 at the last pin as it was flying through the air. More often than not, I'd hit it. Never took my eyes off the pins; sights were in my peripheral vision.Shooting trap is how the Army Air force did it, teaching pilots and gunners to understand lead.