I would remove the barrel & give the bore a vicious scrubbing with a bronze brush & solvent.
IIRC, some of those replicas had shallow rifling (I've never heard of or seen a smoothbore C&B revolver), and the bbl might simply be leaded, giving the appearance of a smoothbore.
Your gun carries the Date Code stamp for 1969.
The "LGG" stamp is most likely a repro cartouche for a Colt inspector from 1896-1904, L. G. Gilmore.
I'd wouldn't get too strenuous with the loads, given that brass frame (ILO steel) - OK for Holy Black, not for any CF conversion cylinder.
Last edited by PetahW; September 25, 2012 at 07:01 PM.