by your name.. i guess your from the same state as me.

all my deer have been taken in massachusetts are under 75yds. i would not worry about the rifled barrel and stay with the " foster " type slugs. they are good out to 75yds or so. just practice. if you are doing drives mix it up with 000 buckshot.
in mass. all i use are foster slugs ( brenneke ) and 000 buckshot. since i see them under 30yds.