Properly tweaked,most smoothbore 870s will stack them inside 3" at 50 yards IF the operator is up to it. Call it 2" at 100 ft.So will lots of other shotguns.
Slugs are not good long distance choices. A trajectory like a rock out past normal Eastern deer ranges is typical. My slug of choice keyholes slightly at 100 yards, and STILL goes into less than 5".
Since much of my hunting is done within 50 yards, a 100 yard group is beside the point.
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