Quoted:
Im considering refinishing my mosin stock but i have never done wood work and dont know what to buy or how to do it any help would be great.
thanks
Denatured alcohol or lacquer thinner will cut through the shellac that's on there currently.
Then it's up to you to decide how you want to go about the rest of it. I suggest some careful 220 grit sanding on any rough spots (don't go crazy here, you want to smooth the surface, not cut 1/8" off of it–– don't destroy the finger grooves and make the buttplate stick over the edge).
Then do 5-10 treatments of heat (blow-dryer or oven, or stock in a plastic bag in the back seat of your car) to get as much of the cosmoline storage grease out of the wood as you can. Heat it and wipe away the cosmoline with a rag soaked in denatured alcohol. Do so until very little or no cosmoline comes out (this could take a LONG time).
Then put whatever new finish on it you want. Boiled Linseed oil, Tung oil, Shellac, polyurethane, spray paint, rhino lining, duracoat....
My personal favorite for old mil-surps is Boiled Linseed Oil (BLO). with BLO and tung oil, you rub a coat into the wood, wipe off excess, let it set a day, and repeat as necessary until you have the desired finish. Don't let excess sit on the surface or it will get crusty and sticky. It takes a while, but it does a great job, IMO.