Firing at metal targets is foolish to say the least with richochet being not only possible but downright probable .
Perhaps this is exactly why one of our public ranges, prohibits their use. No matter how they are made, or placed, you will get some richochets. You might be able to minimize them but not prevent them and just one may be the one that gets you. If you take them for granted, they will bite you. ..
Be Safe !!!