in many states, there's a regulation something to the effect of "you can only use weapons mentioned in the rules". So if your regs talk about stone and metal, it probably rules out bone. Warning- unsolicited opinion follows: I have taken deer with a stone point, but I'm not sure I would go with bone myself. One reason is that I think it might be hard to get them to fly well due to being pretty light weight compared to what I'm used to. Also, while many game animals have been taken this way, I don't think it would have as high of a success rate as stone or steel when encountering bone. A stone point will often go right through a rib, but would a bone point do so?