About a standard clays competition SxS shell is B&Ps Competition One. 12 g 7/8 oz at 1160 FPS. Easy on the gun and shooter. My reloads duplicate it. You can get away with light shot loads in tight choked guns pattern density is fine. Recoil is more projectile weight than anything else. 20's I use 3/4 oz same velocity.

Hunting another thing fewer shots recoil less concern need more pellets for clean kills. Even so 1 oz at 1160 is a good hunting load with mild recoil.

Boats