Update. I made an interesting discovery. I was set to take this revolver to the range last Friday and just happened to check and see what size caps would fit. Answer: Not CCI 10 or 11 and not RWS 1075. None would even start to fit, as they were all too small. There is no apparent damage from dry firing. They all looked fine. Then I got to thinking, Witloe is said to have copied the Remington exactly to specs (except he ran the frame screws in from the right side to prevent fakes). So I was wondering if Civil War era caps and nipples were bigger. I ordered a set of nipples from Track of the Wolf that were threaded to original size and length. They fit fine and take the CCI #11 caps. So, I will go to the range Sunday and see if this dog will hunt. I'll post a report after I try it out.