I have a dedicated slug shooter, its a Remmy 11-87 with a Lupy scope and using 3" lightfield slugs, its accurate to 200 yards. It will group 1 1/2" at 100. 200 Yard drop is 18 inches.
I use an 870 smoothbore for thick woods hunting and I believe that I will either try a rifles choke or buy an open sighted rifled barrel for my 11-87.
This past season I screwed up and took the smoothbore out on opening moring because I was going to sit in the rain all day. I had a deer at 148 yards and the smoothbore was not up to the task. the rifled barrel would have dropped it in its tracks.