I refinished a Mosin Nagant M44 stock because it was nearly unserviceable. Heavy surface damage, deep gouges, and it had apparently been on 3 different rifles.
I chemically stripped the tung oil finish out, sanded with 180 grit sandpaper to remove/lessen the damaged areas and prepare the surface, and applied 2 coats of Dark Ebony oil-based stain. After it had set for several days, I went over it with several coats of clear satin finish all-weather spar urathane, initially sanding with 300 grit between coats, then switching to 800 grit before the final coat.