Luke, I had a 98 Mauser sporter with a full length so called Mannlicher style stock. I bought the thing in pieces and have no idea where the wood came from. It was very light in color and at first I thought it was Maple. Another fellow told me it was Yellow Yew. Very coarse grain and light but it was stable. With a bit of help from Don Robinson in Winfield I managed to make it look presentable.
To make a long story short, every area of the metal on that rifle that touched bare wood was constantly getting rusty.
I talked to a fellow that used to make a living building wooden boats. It seems that "salt" wood was a real issue with those old boats as well as any metal on them if they had ever been on salt water. Commercial boats were already painted or coated before they ever hit the water. Sport boats on the other hand were either painted or coated with spar varnish as well as others. He told me about one fix that always worked for him. He would sand the existing finish down to bare wood and then spray it with several very thin coats of clear fiberglass. No matting just the clear resin. He suggested that I full length glass bed the rifle making sure that no exposed wood was touching any metal.
I was going to glass bed the action anyway so it wasn't a big deal to clean up the rest of the wood. The wood was very blonde so the clear resin was just fine. First of course the action was bedded and then the rifle was taken down and all of the exposed wood in the mag well, screw holes, sling mounts and barrel channel were given several very well thinned down coats of clear resin. The dry wood soaks up the thinned down resin like a sponge. This is good but it takes a couple of days between coats to cure properly. Each of the coats are applied with a brush and are very thin. I had no issues with the stock touching the wood in the barrel channel at all.
That was close to 35 years ago and my step son still has that rifle today. It hasn't rusted ever since the resin coat was applied.