GorV good ol linseed oil will keep the stock looking brand new, properly applied and maintained it will give the stock a mellow, low luster finish. If your gun truly is a "hand rubbed oil finish" then more than likely it was linseed that was used to treat and protect the oil. Taking the action/barrel from the stock and making sure you rub it into the inletting and barrel channel will make sure you are protected properly and even hunting in the rain with it shouldnt be that big of a problem. A good coat rubbed into about 1ce a year will be plenty unless you hunt in very wet conditions (washes some oil out) or hunt in extremely dry climates (the oil drys and evaporates out). Be sure and rub it into the checkering and other cut areas as well. Some cheaper "oil jobs" are applied too the stock before checkering and hardware is applied so you get unprotected wood as a result.

Good luck,
RA