I have an 11-87SP with a 21" smoothbore and rifled sights. It does have a rifled choke. Never really figured out what purpose this setup was originally manufactured for (Turkey?, Deer?, waterfowl?...). Anyways, when I was looking at a rifled barrel for the gun, I chose to go with the muzzleloader instead.

About the same cost depending on model, scope cost is a wash if you want one, accuracy is about the same with arguments for either side and in Michigan, having a muzzleloader drastically extended my season. Michigan also allows the use of muzzleloaders in the shotgun only zone and did I mention it extends the season until late December! It does take a bit of range time to find a load and get comfortable with the gun, loading, etc... However, you want to put something on the wall and an extended season would help.