If you decide to get back into Waterfowl hunting. Just buy a dedicated steel shot gun. then pick one load to shoot in it. I would suggest a Remington 3" 1 1/4oz load of #2 steel. Then shoot it for all waterfowl. Do not get caught up in all the BS hype about whats better. Stuff that 3" remington shell in a cheap 870 Express with a Imp Cyl Choke screwed in and kill birds. If your over big water or Pass shooting. Screw in the Modified. It is realy that simple.
There's a lot of truth in the above comment. I'm big into loading various non-toxic shots from Hevi, HW15, 18g/cc Tungsten, and 19g/cc Tungsten, but when it comes to Woodies or Mallards in timber, pit blinds with big ducks or specks on the menu, or decoyed geese, the Remington 1-1/4oz #2 steel(Or similar #2 loads) will kill effectively and has been doing so successfully for decades.
