You should look at John Kopec's book, "A Study of the COLT SINGLE ACTION ARMY REVOLVER". IMHO, there is so much wrong with this gun that I'm not even sure it is a real Colt, and not a knockoff, or parts gun. The markings aren't right, and I can't tell the actual barrel length, but it looks too short for a 5-1/2" and too long for a 4-3/4", the latter of which were only beginning to be made in that serial number range. The other thing is that the numbers on the bottom of the frame, just forward of the trigger guard numbers don't look right.
As to shooting even black powder, let alone smokeless, I would not guarrantee the gun is safe to shoot at all!
If, as I suspect, this is some sort of knockoff, you have no way of knowing who made it and out of what. The price of $350 is suspicious, even for a gun made up of legitimate Colt's parts!
SAVE YOUR MONEY, PARD, AND ADD TO IT SO YOU CAN GET A GOOD GUN! Sorry.