RE: slugs sabots
You can use either in a rifled barrel. It's just that using rifled slugs in a rifled barrel will make it dirty very fast and you will have to spend more time getting the lead out of it. Mine leads up after about 4 shots or so and starts to effect accuracy.
However my accuracy is very good with some rifled slugs at 100 yards. I am still debating whether I want to use the sabots or the cheaper slugs. I'm going to use brenneke magnum gold's this year but I think I can do better in the accuracy department. I just ran out of money and time to experiment is all.
Sabots are much cleaner and most have better range and trajectory, they just cost much more.
Paul