Rabbit's got it close to what I use - - which is a 1/3rd mixture of linseed, melted beeswax and turp. Make this up on a little Coleman rigged as a double burner. The stuff is out of early match shooting - at least, that's one story I've heard. When the mixture cools, I store it in a tight-lidded, open-mouthed jar and apply dabs as needed.
I treat all the wood and rub it in. I'll take a an old tooth brush to the checkering and that solves that part of the problem. If you like the scent of turp, well, you're addicted from this time forward.
