I have a pair of 1860 Colt Armies (Uberti) done by Th Goon and they are as reliable as cartridge guns. The only other change I made was to replace the nipples with Slixshot made for #10 Remington caps. 600 total rounds later I have yet to have a cap jam, second strike or other problem.
This is using a 30 grain GOEX FFFg ball and lube wad combination which is not a wimpy load.
Mike is meticulous with his work, but well worth the wait.
Bunk