It is actually fine to shoot this Colt with modern smokeless powder, as it dates to 1901. Further proof that it is okay to shoot, is that the transverse pin is evident, as opposed to the screw that was present in the old black powder revolvers. I have read that this transition occurred in 1896, at around serial number 165,000.Do not shoot this nice Colt. It is a on the border of Nitro and Blackpowder. I think when you shoot nitro with it you blow this revolver up. Treassure it.