I second Coffin Maker's advice. Shoot black powder only in that revolver. You have no idea what might have bee fired through it, including factory smokeless ammunition loaded with 180g jacketed soft points. And just because someone got away with it, doesn't mean the next time you fire a smokeless powder load, with it's high peaking pressure spike, something will let go.
Get it inspected by a competent gunsmith, familiar with 19th Century firearms, and if it is pronounced sound, shoot some black powder, cast bullet rounds through it. Despite all the naysayers who fear having to clean black powder fouling, you might just find you injoy shooting this fine old, family revolver, just the way you grand-dad might have shot it in his younger days.
YMMV,
Dave