Ben's right. Get a Skeet I or Improved Cylinder choke and try that. With the non sabot loads, lots of us have had good results with the KO Brenneke slug, but you need to test any slug you try.
Other ones good in at least one of my slug 870s include the Classic Fed and the Winchester 1 oz HP. Out of those and the Rottweil Brenneke, you'll find a keeper.
You might want to research the Archives for slugs and testing same, it's a fantastic lode of info.
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