Hunter.a 20 ga. will do fine.you can shoot as far as a 12 ga.just place your shot where it has to be.thats all i used for years and killed a lot of game with one .besides you dont want a gun that will beat the heck out of the shoulders.there are a few guys i know who shoot then with 410s here.just have to set the decoys a little closer thats all.i use the big gun so i dont have to ever have to chase them down.bigkentk