how do I get one of those really "shiny" finishes on a stock using things like household materials? I have used lin-seed oil, and have cut back a little with steel wool, but want a really professional looking finish. What do I use?

Try hand rubbing some coats of Teak oil. Use just a dab, like the end of your finger tip and rub it until it is smooth and hot. Go over the whole stock, don't put a lot on and do that for five or six nights and let it dry for a day in between. 5f pumice stone can be used with finish to bring up a high sheen if you go about it lightly. I am not sure what you mean by household materials. I use finishing materials when I finish a stock and you may not have it in your home but it can be purchased at paint stores. If you go looking for Teak oil, try a marine store.

Well, it's not household but I think you can get a small jar of Birchwood Casey Tru-oil for $4-6. Put 6-8 coats rubbing in well and using 0000 steel wool between the coats and you'll get a nice high gloss finish.