10 gauge bird load knocks em down!
I have the Pedersoli SxS in 10 Ga. I use 3Fg Goex (72 grains) along with 1.5 to 1 7/8 oz. of 7 1/2 shot. Nice tight pattern, doesn't kick much, and is very successful in harvesting pheasants as well as clay birds.
Some folks talk about reaming-out nipples for more spark--I just use the CCI Magnum #11's and with the same 3Fg I use for my .50 Trade Rifle load, everything just works! 72 grains of 3F works out to about 80 grains of 2F, so the pressure isn't a problem.
I use a .125 over-powder card from Circle-Fly, a lubed wonder-wad, as well as 11 gauge shot buffer and then the shot, and then 11 gauge over-shot cards. Don't just assume that your gun will take 10 gauge acc's, especially if it is the older one without the interchangeable chokes.
Good luck and make smoke!
Dave