While the article states this:
Only shoot at cardboard/paper targets, ***self-healing targets***, manufactured metallic targets, or manufactured thrown-type clay targets.

The actual rules are this:
Use only approved targets. On the ARP approved targets are: cardboard targets, paper targets, manufactured metallic targets (metal targets specifically designed for firearms), or manufactured thrown-type clay targets (clay pigeons). Please note: exploding targets are not permitted.

Also, a HUGE problem with shooters on the Grasslands is a lack of a backstop. I see it EVERY time I go out there.