Hi Dave,
You would be wise to use the search function and search for tung oil finish and polymerized tung oil. You will find many posts over the years with all the information you could ever want. Raw 100% tung oil is not a very good finish for gunstocks nor is 100% raw linseed oil. They take months to dry and may never really cure. Moreover, oil in the wood finishes are mostly a modern creation. Gun makers in the 18th and early 19th centuries used oil-varnishes mostly. I use Sutherland Welles polymerized tung oil on my guns. The oil is heat treated to speed up the polymerization (curing) and other solvents are added as well. It usually dries to the touch in 4-6 hours and is ready for another coat in 24. It cures within 3 weeks to a month depending on heat, humidity and exposure to UV light. Since you are already using 100% raw tung oil let me offer a suggestion based on my own experience. Go to your hardware store and buy a small can of polyurethane varnish. Then mix your tung oil with the varnish as follows: 25% tung oil, 25% polyurethane, and 50% mineral spirits. This mix will soak in giving an "in the wood oil" look or it can be built up to a higher gloss. Better, it will dry to the touch in 12 hours and be ready for another coat in 24, and cures within 1 month.
dave