I have a 870 with a smooth bore slug barrel and a 1187 with a rifled barrel. I shoot rifled slug through both. I get good groups with the smooth bore out to about 80 yards. After that it doesn't do as well. Last year I shot 2 deer with my 1187 with rifled barrel/rifeld slugs 127 and 138 yards. As mentioned above there is lead fowling in the rifled barrel using rifled slugs, but thats what they make cleaner solvents for. I'm not willing just yet to pay $10+ per box of 5 sabots over $1.98 for 5 rifled slugs but thats me. I clean my barrel well sfter the season ans haven't had any problems.