I ran on to a guy a while back that sold me some black powder. He called me up the other day and wanted to know if I would be interested in buying a Ruger Old Army. I had him send me a picture and it has the brass grip frame. From what little I've heard, they seem to be worth a bit more for some reason. Please advise me on what price range I should stay in, as I'm not the resident expert with it come to black powder revolvers.