Justin - interesting find. Have you checked how much you will be charged for the re-bore and rifling?
Last time I looked into that, a brand new barrel was over $100.00 cheaper.
If the pits aren't too deep, it would make a dandy .40 to .45 cal plank rifle. I would not go larger
or the bl. would lose it's weight advantage. Depends, of course, on what you want to build with it.