I have used an L.C.Smith 3" Ideal Grade Longrange Gun exclusively for my waterfowling for the last 5 seasons now. It has the 'special boring', and retains its tight original chokes. I load 1 1/8 ounce Nice Shot or 1 1/4ounce Bismuth, at 1250 fps, in 2 3/4" AA hulls. The gun and 'light' loads kills decoyed geese and ducks with alacrity. IMO there just isn't a need for truly heavy loads unless one is pass shooting, and even then...
Mind you, its effectiveness with such light loads I feel is due to the tight chokes. Enough pellets are brought to bear on the target to effect clean kills, albeit forcing me to bear down a bit more than when shooting an open choked gun- which is not a bad thing IMO.
