I've got an older Pietta  that I converted with a Howell cylinder. It has never failed to function, EXCEPT when I first bought it I sat around dry-firing it and ruined the timing. I sent it back to Cabellas in 1997, they fixed and returned it to me. But, that's when they had an on-site gun-smith. That's not the case anymore. Anyway, I converted it about 5 years ago and it has operated flawlessly ever since, with .45 cowboy loads. If it's an Uberti, you can expect similar, and according to some, better performance.