Although most of my waterfowl hunting (ducks and geese) is with a 12 gauge, I occasionally will take a 20 gauge with 3" Hevishot shells. The 12 has a bigger payload and hits them harder but the 20 works. I am not a "skybuster" and do not take passing shots at 60 yards with any shotgun.
My wife uses 20 gauge shotguns and has piled up waterfowl very nicely with one. She has some very nice semi-automatic shotguns but always takes her little 870 Youth model (pump action) for waterfowl.
Last edited by Big Uncle; 03-21-2018 at 05:29 AM.