My 2 preferred Sporting Clays loads are 2 3/4" 1 oz. 1300 fps & 2 3/4 7/8 oz 1275 fps. The 1 oz load is AA Super Sport. The 7/8 load, I came across one flat of Federal Paper Cowboy Action loads in the late 90' or early 00's. I found a matching load for AA hulls using Tightwad. It works my 390 Golden Clays and is mild in everything else. The pattern is uniform with Modified and Improved Modified chokes.
Years ago WM sold a Federal 12 gauge 2 3/4", 7/8oz @ 1400fps and a 20 gauge 2 3/4", 3/4 oz at 1400fps. Using IM and F chokes and 7.5 shot, these were great for Sporting Clays ay longer yardages. But extremely loud (even with muffs and foam plugs!) I have never been able to duplicate these shells. The 1275 load is a great training load due to very low recoil, yet it smokes clay birds!
Cowboy Action typically shoots around one box (25) a day. Skeet, Trap, and Sport Clays, you can shoot up to 100 rounds an hour, for as long as you want or can stand! So Recoil matters!
Ivan