If I really wanted to shoot sabots, I would look for something like a 1-28 twist. I have a Great Plains Hunter .50 caliber flintlock. It shoots sabots pretty good. But to be honest I think it will show its true colors with a conical bullet. Once I find the right one.
And I am the first to admit.. traditional, open sights, I just can't shoot long distances and get the kind of accuracy I would demand, to shoot those distances hunting. There are some here that can do it. Don't get me wrong. And maybe you're one of them. So the best of luck to you.