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It will all depend on what gun you are talking about. GENERALLY speaking, most advice is not to use tighter than Mod for several reasons - barrel bulge/bursting and poor pattern performance. A full choke with steel can actually give you more like an IC pattern as the pattern can have a doughnut shape with flyers. I would try an IC or M on the pattern plate with the ammo you intend to use to see what you get.
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