I have two Pietta 1858 revolvers, one is a case hardened model that I have an R&D 45 ACP conversion in. It works fine. The other is a target model that I have a 45 Colt conversion in. The 45 ACP works fine in both. I put the 45 Colt into the case hardened one, and when I start to pull the trigger the cylinder stop bolt releases and the cylinder does not stay locked. Both conversions are made for Pietta. Any idea what's wrong? Thanks