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If your gun is a 3-1/2, those shells are quite necessary. LOL!! On certain days, my hunting pards with 3.5's definitely drop more of those longer range birds than I do with my 3's. More BB's equates to more strikes. You can't argue with the numbers if all things are equal.
I should also state that when real late season comes around (late November -- end of season I bring out my 10 gauge and shoot BB, BBB, T, or F shots. Have quite a few old 10 gauge boxes since I don't shoot it much lol.