Can be great for geese. I have shot them before at snows since those shots tend to be longer. I don't shoot them that often since I like my canada geese up close and personal.
For ducks, 3" should be plenty. My buddy shot some 3.5" and was just smoking them. Guess it depends on what you prefer. It will be awful hard on that shoulder to shoot alot of 3.5" out of that Nova.
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