I second the idea of a Green Mountain 1-28 barrel. I've had one for 5 years. My original TC Hawken .54 was a great round-baller, but when it came to conicals, I was never happy. The best I ever found was the larger .54 Buffalo bullets.
The Green Mountain barrel is finicky, but the lead Powerbelts ended up giving me a decent group gave me a good group at 50 yards, and that was all I felt I needed. I shoot Triple 7.
