Very interesting. Terry Wieland I believe spoke very highly of in particular Australian walnut for DG rifles. Key words were hardness and strength. I hope you post some pictures once you receive the 500NE Shikari.
Speaking of hardness, I commissioned a custom rifle some years ago and supplied the hardest and most straight grained walnut I could find. Strictly old school build with old school hand in letting of the action. Then I received this picture from the gun maker with the "complaint" that his hand tools wore out and did not bite properly..
View attachment 759144Then about a month later i received this one, first layer of alcanet oil. Definitely worth the looong wait.
View attachment 759145