I dont' shy away from thin ringed osage. The important part in my experience, is the ratio or relationship between the early "spring growth" and the summer growth rings. The corky, spring growth rings are pretty much junk wood. If your spring growth rings are thicker than your summer growth (denser) rings, you are generally limited to a low poundage bow and susceptable to breakage. If your summer growth rings are thin and your spring growth rings are half that thickness, you will end up with a very stable bow.