I wonder why of all the trees that grow Walnut is a favourite for gunstocks , surely there must be other choices in this wide world?
Husqvarna stocked guns in at least three different woods ............birch, beech and walnut.
I have a 1947 model Husqvarna Mauser sporting rifle (.220 Swift) that is stocked in what they called Arctic Birch, but it is really Silver Birch I believe. I've had it for many years and it seems to be a stable wood, and it doesn't seem to be much different than black walnut in density, though usually somewhat lighter in color.
SRH