muzzle loaders have their time and place depending upon how you hunt. If you are pushing deer, they are obsolete. I have, as well as know of, slug guns that will shoot better or shoot with a ML any day. I have a SBE II that has a 3-9 on it that will shoot an stack 3 remington accutips at a hundred and not much worse at 200. I always take a shooting stick with me so its really not a whole lot different than shooting a rifle.
To the OP:
how are you planning on hunting? I've been doing it in Iowa for a long time, and seen what works and what doesn't. Don't believe me? I have lots of pictures.
I wouldn't waste my time with a smooth bore or rifled choke tube. I've shot hundreds of rifled slugs out of a smooth bore. Ya they are cheap, and hit a deer like a train but they are like shooting rocks out of a sling shot. They are slow and drop a mile. If you are shooting at a deer on the run with a scope, often times you cannot lead them far enough. Some guns will shoot them fantastic at 50 yds, but not at 100. Why limit yourself to such short yardage?
I'd be looking for a slug gun with an integrated reciever like a SBE. Ya they are expensive, but they shoot lights out. The reciever is integrated with the barrel, the scope is attached to the barrel and never has to be taken off, and they are reliable. You can always get your money out of a SBE slug gun. If thats not your style, get a savage 212 and shoot rem accutips. My brother uses one and loves it. There's nothing purtty about it but you can't argue that it works. He shot 2 nice bucks this year at 200 yards and were clean DRT kills.
If you decide to go with a rifled barrel, I would highly reccommend the acutips. They are a great slug, fly straight, and hit hard. The barnes are even better, but federal discontinued them this last year. I would stay away from the hornady SST. They shoot great, but they don't have that knockdown factor.
All those bucks were taken by our 8 person group by the book in the last couple of years. We all shoot rifled barrels and sabots except one person. He carries his shotgun and muzzleloader everywhere he goes.