Back to the forum for more help.... continuing progress on a No. 3 supposedly made around 1878 ( 3 digit serial number - estimate by Smith & Wesson )... I rebuilt the hammer and made a working hand that functions and locks up tight and in time. I have popped off a couple primers in a empty case to check function and timing. I'm still a long way from an actual test firing and after doing a LOT of research I've come to the conclusion that it would not be prudent or safe to try to put a CASS load round through it and I had better stick with a black powder round. I'd like to get some opinions and comments if I could... as always thanks. I'm going to measure the bore and "slug " the barrel to make sure no matter what I wind up with, it will not over pressure this fine old revolver. Thanks to all