"As far as what one FEELS . . . there you get into an area that can't really be measured. But blind tests conducted with British shotshells and reported by the late British shotgun guru Gough Thomas showed that a team of shooters " . . . unanimously voted that the variety giving the least sensible (felt) recoil were those that, unknown to them, had been loaded with the fastest-burning powder."
Which is the opposite of the thoughts of every single trapshooter I used to shoot with years ago. They loaded Green Dot and PB to 'spread the recoil out over time'. Push vs. sharp kick.
I read Garwood 20 years later and just shook my head. His dissertation on tiny headspace variations making enormous differences in felt recoil is rich too.
He may have been an engineer, but his train was off the rails.
