That Black Walnut game is a dangerous game to play. A local sawmill here was actually buying yard trees. I know this guy had at least $ 900 invested in this tree, plus paying us to cut it down to a min. 16' ft. spar, $300 (this was years ago), then he had to haul his small Cat 25mi for one tree and play around winching and pulling the trunk out the owners yard, this was Feb. soft ground and all, ruts and broken sidewalks, what a mess. Then he had to load and haul back to his log yard.
This was a very nice looking Walnut, veneer grade to me. After all this fuss for one tree, the timber buyer rejected it for veneer, some thing about bird peck in it?? only good for saw boards , talk about a big time loss.
We also did another tree for the same guy, the second Walnut, to me anyway was a rattier looking tree, the buyer loved this one for some reason. Unfortunately, the second tree didn't cancel the loss from the other tree. This Black Walnut is just a speculative game to me if your in the board business.
Larry