Thanks for the input so far...
I have as a matter of fact used both FMJ's and lead 230 grain rounds in it so far with no signs of trouble... maybe I'm lucky or just haven't had a problem yet.
The FMJ's were factory Winchester white box 100 ct from wally world and the lead ball ammo was personal reloads with 5.0grs of Winchester 231. It is a surprisingly accurate pistol; more so than its counterpart look alike my Catelman 1873 in 45LC. Next I am going to modify the firing pin to a thinner point so it will detonate the 45ACP primmers reliably. I may order another barrel that doesen't state CAL .44 BLACK BOWDER ONLY as I do not ever plan to shoot it as a black powder pistol.
For Sale: One never used .44 Cal Black powder A. Uberti cylinder.