Varnish should NEVER be used on Firearm Furniture in any case! Wood is a living medium, & if You varnish it. It cannot 'Breath'. It needs to be supple to absorb minor knocks & reform to it's normal surface shape.
After rubbing down & striking off. BOILED (NOT 'Normal') linseed oilshould be liberally worked into the wood surface. I used to let butt stocks stand upright in a bowl of the stuff. To allow the wood grain to absorb it by 'sucking' it up!
If the wood on a butt for example. Is allowed to dry out. It becomes very brittle. & it only takes an accidental drop of the rifle on it's butt. To split it up a fair way, or break a chunk out!
You cannot equal the lovely feel when handling. Or indeed the Asthetic appeal of wooden furniture on a weapon!![]()