I guess that I'm with Brent. And the Old Guys would have relined or freshed out a non-shooter in a heartbeat, so what you're contemplating is at least "traditional." I'm not a collector so can't make the complex "calculus of value" (i.e. is an original rifle with a lousy bore more valuable to a collector than a nice Sharps with an eminently shootable, but not original bore? I SUSPECT that most collectors would say DON'T alter it, even to get it shooting again....but I would anyway, or sell it to a collector, and replace it with a replica, if the $$$ worked better that way.). Anyway, the only value that matters is to YOU.
Whether to reline or rebore depends on a lot of things, especially what caliber it is now and what caliber you want. Neither is visible on the outside of the gun if done right.
