I bought a Pietta 1851 Confederate Colt Navy .44 cap & ball revolver a few months ago and i have recently been looking to convert over to cartridge. I was looking around and i noticed that alot of these cylinders say "not to use with brass frame pistols", well i have a brass frame and i was wondering just why you cant use them with the brass frames? and are there any you CAN use with brass frame? I bought a brass frame because i thought it looked beter... last time i buy for looks :/