Shot skeet for decades, everyone loaded their own shells in those years. Components were cheap and plentiful in those days, Winchester AA compression formed hulls gave the best milage and everyone used #9 shot, no one but no one used 7.5. You want every pellet you can, if extra hard #9 ( more antimony ) was available we saved that for club or registered shoots.
Haven’t shot much skeet since sporting clays hit Ontario, before that a few of us from the Orillia Club would travel every few weeks down to the Rochester Brooks club south of Rochester NY by Henrietta to shoot sporting clays. We all loaded #8’s for clays.
I only shoot clays casually now, buy my shells by the flats. Score, Challenger, Federal, Remington, what ever I can get cheap. Reloading components are not cheap and hard to get, gave that up years ago.
RECÀP…… #9’s for skeet….. #8 or # 7.5. For clays depending on presentation….. #7.5’s for trap