I used to monkey around with carrying different shot sizes, but I think I'm done with that and am going back to 3" #2 for all. There's a reason this time of the year you can barely find that shot size on the shelves--because, although not the best for either, it's the best all around for ducks and geese. Ducks only, #4 all day, and honestly I would have no problem shooting woodies and early season mallards with #5 or #6. Just when geese are in the picture, #2 is that happy medium. As far as brand goes, I really like Hevi Metal. I used to use BB or BBB when I am goose hunting, but I have found that 3" #2 Hevi Metal shells handle geese just fine and patterns better than the BB and BBB out of my tighter chokes.