I may be over cautious, but I will not shoot any Smokeless Powder in any Colt SAA revolver manufactured before 1903. Although you will find the S/N beinning at 190,000 (this is from memory, but close) is safe using Smokless Powder. In the day that may have been correct and would be fine, but no one know how a 1st Gen from 1897 has been treated. Has it had some heavy loads of smokless in it's past life; we don't know and this is what bothers me. There could be some unseen problem that could cause the Frame, Cylinder, etc to crack or break from a load of current smokeless powder. You don't want to hurt the revolver or yourself.....be safe than sorry!