Update: Got to shoot it at a local match. wow, dead nuts on! Shot clean on pistol targets, including steel chickens at 25 yards! Action, smooth and crisp, and about a 3 lb trigger. The Uberti 1858s, including the gated conversion, seem to be a little bit bigger between trigger guard and grip frame area. With mu 6.0 grains Trail Boss in a 45 Schofiled case with a 200 grain bullet, I did not get the third finger knuckle bump I got from my Piettas with R&D cylinders.
I'll shoot it on paper and see how and where exactly it groups.