The local trap club has allowed me to put in a rifle range. I have put up a target holder for paper targets but thought a metal gong would give people something to shoot at if they did not bring a paper target. This is a small town range open to anyone at any time kind of thing. How safe is a metal gong at 100 and 200 yards? Is there any danger of ricochet? Do you hang them angled down? How thick? Any ideas would be appreciated. Thanks in advance.