I just picked up a 1858 Remington E.N. Santa Barbara that appears in pretty good condition, used but not abused, and have a few questions for those out there that have owned one of these. Will it use a .454 round ball or need a .451 like the Centaur's? Any thoughts on replacement nipples, these look fine but in the event that they ever need to be replaced a little info would be great, not sure if Uberti or Pietta would be same threads or not. I've scanned the internet on these questions and have not gotten any insights so hope someone here has the answers. Thank you in advance.