Not going to shoot well if the rifling is screwed up and it hasn't been counterbored.
Wonder if you could cut/crown, then cut a new dovetail with the Wheeler dovetail cutting fixture and install a new Williams front sight that would work...
Or, get a short-chambered replacement barrel from someplace like Numrich:
http://www.gunpartscorp.com/Manufact...rels-34391.htm