The Lyman Great Plains Hunter with the 1-32 twist will be the best option if you want to shoot sabots. Another option is find a rifle that has a drop in barrel ability and you can then get a Green Mountain Barrel with a 1-28 twist that will shoot sabots with a good powerful charge.

From what I have read in posts, the GPH seems to be a real good shooter... My friend has one, but he shoots Lyman Maxi Ball out of his with some amazing accuracy.