RAG- im no pro. but, i just put my first coat of BLO on my K98 stock.
the upsides to BLO- easy to apply, dont need to mix it with anything- if the stock needs a touch up, just BLO it again and let it dry.
ive "heard" tung oil takes a long time to cure. BLO really only takes 24 hours to be dry. tung oil will protect against water better than BLO from what ive read, but in my personal life- my '38 mauser WONT be out in the rain, so water penetration isnt a concern, to me at least.
people say the BLO will make the stock darker- but most will reply saying it will be barely noticeable.
ETA ive read that you should stay away from MINWAX for a rifle. again, not being a pro, but you might want to find out if there is cosmoline soaked into the rifle stock before you finish it. if there is, you might want to sweat it out.
dont quote me on any of this, just reffering things that ive picked up from reading forums.
some people say to use howards feed and wax- i wouldnt. its just a layer, doesnt soak into the stock.
and if you do want PURE tung oil, you have to order it. the stores probably wont stock it in PURE form.