Custom Pro Oil from Brownells is a Tung oil/urethane product that works great. It's slow drying, so I use Tru-oil for in between coats.
This Boyd Jon Sundra birch laminated stock was finished that way, using Fiebings dark brown leather dye to color the finish NOT the wood. I learned that process from a master stock maker who worked at Fajen's back in the day, has since been self-employed for years.
This finish is super tough, has stood the test of time. This gun has been hunted for at least 8 years, has killed several NM pronghorns, a bunch of WT's and hogs. And still looks good; I've never touched up the finish.
DF