881, that's a big question.A bit of research in the archives will gvie you some answers.
Slugs usually work best through open chokes.
Non toxics like steel,bismuth and the alloys of tungsten,etc, have their own rules. Mostly, extremely open ot tight chokes do not do well.
Large lead pellets like the buck loads tend to respond to a little bit of choke. Modified is close to max tightest for most loads.
There are exceptions to all the above. These are loose rules.
HTH....