Don't sell that pitted barrel short. I have a rifle that ispitted that but is still an exceptional shooter. All you can do it try the rifle out on the range.

As for the Green Mountian Barrels, check Track of the Wolf for prices. If you want a conical shooter, then get teh 1:28 twist and that should stand the best chance of shooting sabots and conicals. Their 1-70 are great roundball shooters, and in a .54 caliber will be an excellent deer/large game rifle.