I am an avid collector and speaking for myself and others I know, we would never touch a refinished stock. I have never seen the need to refinish a gun simply because it has a boo boo. But if refinishing is the only option, sandpaper is the ultimate evil. Chemical stripping the old finish is the only option I would ever consider. Sandpper has ruined so many stocks, I have lost count. Winchester used a special dye on their wood. There is a company that reproduces this dye. When finish is applied, Winchester didnt use an oil finish but instead used a sprayed on varnish. One thing to remember, that once an action is taken it can never be undone.