Shotguns can be EXTREMELY picky with slugs. One gun will like one brand of slugs and a different gun will shoot terribly with that brand and will shoot fine with a different brand. You'll have to experiment to find the combination that works best with you.
One thing to consider. Since your shotgun is a smooth bore, don't waste your money on high-dollar sabot slugs. Those are only for rifled barrels and will likely shoot poorly in your smooth bore plus they will wear your wallet out.
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