I got some super fancy claro walnut, which runs rather porous. I could have finished it with Tru Oil and gotten a nice finish, but it doesn't penetrate very deep. I had them stabilized and then cut for a pistol grip. I will still use Tru Oil as the final finish just to fill the pores that were opened by machining, but the wood is far more stable after the process and much harder.
Untreated walnut has been used for gunstocks and knife handles since long before Jim Bowie, but I see it as just one more advance that wasn't available earlier.