If you do not whisker the wood it, walnut anyway, will Whisker Itself over the years from just indoor humidity.
19th Century US Musket walnut stocks were scraped, I do not believe sanded, then dunked in hot linseed oil (the real stuff, cold pressed not modern hardware) + turpentine (again real stuff). Collectors really like to find muskets with that nice prickly surface, from the grain raising over the years. This means no one has refinished it.