I really do not want to chime in here but I am going to .
I used to load about 8 different loads for all the shotgun games.
I loaded from 9 to 5's, and in 7/8 1, 1 1/8, and 1 1/4 oz depending on the game where I thought I would have the best advantage.
I later settled on just 9's, 7.5, 7 and 6's Yes 7's. in 2 loads 1 1/8 and 1 1/4 oz.
It became a large pain in the toosh to try and keep track of all the different loads.
For me the red AA Hulls are 1 1/8 oz 7.5 @ 1200 FPS - great for sporting clays, handicap trap, and hunting Dove and quail
The Gray AA hulls are 1 1/8 oz #9 @ 1200 FPS - great for Trap Singles (16 yard line) Double trap, sporting clays, Skeet, and dove.
The Green STS hulls are 1 1/4 oz @ 1300 FPS #6 - Hunting loads. Wild phesants.
The Gold Premier Rem hulls are 1 1/4 oz @1300 FPS # 7 Pot shoots, Anne Oakleys, Rabbit shoots, and Hunting birds larger than quail.
I found that the same shells that I use to hunt work perfect for targets and I am used to shooting them.
I also found that consistancy is what got me shooting better.
Pick a Hull, Pick a powder, pick a wad, pick a loading and load a thousand of them and go shoot the same game for a while- Trap, Skeet, sporting clays, or other shotgun sport. Shooting the same load at targets will make you a better shooter. After you smack 24 and 25's consistantly then start playing with different loads, different size shot or components when you want to win tournaments. but you need the fundamentals first.