Myrtle is very nice. Redwood is too soft and has a very open grain. Mesquite can make for gorgeous stocks, but it is expensive and pure hell on tools. There is a lot of sand embedded in the wood, and a lot of voids and imperfections. Rosewood is pretty, but heavy and often oily and difficult to finish. Careful with tropical hardwoods, as sawdust from those can be irritating or toxic, but you probably already know that. I've seen some nice stocks made from locust and olive, but I don't know anything about their stability. If you can find actual European walnut, it has a completely different character from black walnut or most California walnut. Personally, I'm not a fan of maple for riflestocks, except on muzzleloaders. Mechanically, it's great wood, I just don't care for the look of it. Too Weatherby.