Due to the recoil, I wouldn't shoot 3.5" from a pump. For turkeys, I like high-density shot with 3" shells, since the shots are infrequent and the cost is therefore bearable. I think the main advantage of 3.5" shells is they have space to hold enough large steel shot to throw a decent pattern for waterfowl. If one wants to spend the extra $$ for high-density shot in the numbers most people use for waterfowl, 3" shells should be fine, but for steel there is something to be said for 3.5" shells.
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