Sorry, I just saw this post. Haven't had much time to play on forums lately.
Like 03Mossy said, I have a smokeless barrel on my Pro Hunter. Mine is an MGM barrel built on a Shilen blank. It's a 1-14 twist as that's what MGM recommended. Mine is an actual muzzleloader barrel, not a 45-70 conversion. If you go this route just don't mention smokeless when you order it. They don't want the liability and won't make you one.
With everything that's gone on this summer I haven't had much time to play with it. It seems like it has potential I just need to wring it out a little.