I would say a bedded and pillared walnut stock will be less perfect than a bedded and pillared laminate stock for the reasons you stated. Perhaps the best stock for long range precision is some sort of quality composite stock that's has an aluminum bedding or something. I don't know if composites are better than laminates, but a solid piece of walnut or maple or anything else is not the best for accuracy. They do look nice, though, and for hunting, that's what I prefer. :) I look for 1/2 MOA from 100-300 yards on all my hunting rifles, and I have never failed to get it or better, regardless of the wood.