Its called an umbrella liability policy, call your homeowner's or auto carrier. Unless it specifically excludes any liability arising from the use of a firearm, (never saw that in an umbrella policy) it will provide the coverage in the bill which says willful or negligent acts (not Criminal acts). It doesnt just cover a shooting but anything you may do and be sued for. If you drive a car, or do anything dangerous like walk outside, you should have an umbrella policy. Please note I DO NOT SUPPORT THE LAW WHICH WILL NOT PASS ANYWAY.