Hey bounty,
Traditions and Uberti are both good names in the field, and I doubt that I'm telling you anything that you don't already know, but here goes;
black powder burns a LOT slower than smokeless, so don't expect to get anywhere near "modern" performance with it in terms of velocity or energy, however, with the right charge, and the right sized bullet (swaged to properly fit the bore), black powder arms can be every bit as accurate as any smokeless bullet spitter out there. Several years ago, my dad and I both belonged to the NSSA, both had "identical" zouave .58 muskets, but his took a .577 with 37 grains (for peak accuracy), while mine shot best with a .580 and 40 grains. At 100 yards, anyone on our team could shoot a 1 1/2 inch group off-hand, but if Dad and I got our loads mixed up, neither one could hit the broad side of a barn.
Black powder shooting can be a lot of fun, and if the gundummies get their way, may become a neccessity, but it's a whole different world than smokeless. If you've got any specific questions, feel free to shoot me a line, and by the way, have you looked at a LeMatt yet? Do so before you buy anything, if I read your taste in guns as well as I think, you'll like them, I do.

Troy