Good question,...one that I can't answer, but I would start out by looking into your state laws about liability for such matters. In addition, no matter what you find out and what insurance you might end up getting, I would make sure every single person that hunts the property has signed a waiver of liability agreement that covers every imaginable circumstance.
Also, if you have a dwelling on the property that you have home owners insurance for, it is possible that you can add protection under that policy.
