Jim Gregg the pro at the old Seattle Skeet & Trap Club when I was in college use to teach that. I once watched him shoot a round of skeet with a Model 12 Skeet Gun and never bring the butt above his elbow. Got 23. In my retirement I ran into him at a little gun show at Moses Lake. He was still at it with all types of firearms --
https://www.amazon.com/Gregg-Method-.../dp/0975906801