You can do this, but I Have never SEEN a stock that has been artificially striped, that looks even close to the real deal. Mother Nature puts the "fiddleback"(Tigerstripe) into the wood.
I have seen it done with stains, paint(UGH!) and by heating the wood up with a torch and sanding off the char.
May I suggest you try several of these approaches with pieces of scrap wood, before you commit your gunstock to this. There is absolutely NOTHING wrong with a stock made of plain, straight grained wood, without fiddleback. The fancy stocks cost a lot of money back then, as they do now. The Straight grained wood was what made it onto guns that were USED, not looked at over the mantel. :hmm: