The wax typically used is carnauba - it is the hardest natural wax in nature.
The finish that is applied is typically carnauba melted in to boiled linseed oil - with some Japan drier added.
A few drops of this massaged into the stock by hand is the best treatment for an oiled stock - best done with a glass of you favorite adult beverage while sitting next to a warm fire on a cold, rainy/snowy night.
All good suggestions. The only problem I have had is that if the pores in the wood are somewhat open, the wax will accumulated in them and leave white spots that are hard to polish out. This was primarily with the Birchwood Casey stock wax product.
The one I mention is what the English gun trade uses in the original finish on the stocks. The linseed oil is the carrier agent, the carnauba fills the pores. I've never seen a white residue left behind.