All the full stock longrifles I have measured (including southern mountain rifles) had swamped barrels. The swamp was usually slight, and the barrels were still very, very heavy. I don't think you see true straight barrels until mid 19th century. If you want a barrel as heavy as most of the original southern mountain rifles, you probably need to go with a straight barrel. However, I really don't think most people these days want that weight unless they are building a chunk gun. I have built mountain rifles with straight barrels, but I wouldn't do it now unless I was building a target gun. For any hunting rifle, I would use a swamped barrel. Both Rice and Getz make a light weight profile which has less swamp than their regular profiles and works well for southern guns from a visual point of view. It makes for an exceptionally light weight rifle.
