smoothbores and foster (win/rem/federal plain rifled slugs) or breneke slugs vary... but generally expect paper plate or better groups at 75yds.. often the limitation is not the bore, but the sighting arrangement. My Mossberg will make "palm of your hand' size groups at 75yds.. the breaktop single shot (bead sight) I started deer hunting with would consistently hit a deers ribcage (or a gallon milk jug) out to about 80yds.. your mileage may vary, and your accuracy with bead sights may limit you to 60yds..