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100% benelli SBE!!!!!!!!!!!!!!!!!!!!
I don't see the need for 3 1/2" for ducks, but I can see the need for geese. So, if you also plan on goose hunting, it seems like 3.5" would be in order. Myself, I think I'd just opt for Hevi-shot loads for the few times I might go goose hunting.
The reason there are so many Ruger upgrades is because they're necessary.
And don't try to tell me that most goose hunters only take shots at 20 yards or less.