Check out the reviews on X-caliber barrels here. I have one but have yet to shoot it so I can't say. I also have a Kreiger but you might have to wait 3 months for a Kreiger. Bartlien makes a good barrel as does Schnieder, Hart, Shilien, Lilja, but I am sure you know that and time line on some of them could be long.
Some of those are cut rifled some pull buttoned, alos the above advice about BHW barrels is good as well.