IMHO,
Jim's barrels are lapped and absolutely the best.
However, he only makes straight octagon barrels. In a longrifle, this makes a very muzzle heavy gun. Again, not an joy to handle offhand.
But as a bench gun, the best.
I built a 40cal Vincent a few years back. Put in a .395 ball, 45g FFFG, and made one ragged hole with the first five shots.
I even made a phone call to Jim to let him know how pleased I was.
He seemed almost offended. He said " Yeah, that's what they're supposed to do". End of conversation.
In summary, for a great handling offhand rifle, there are some great swamped barresl ou there. For a "GREAT" bench gun, buy the Goodoien.