Use steel targets you can take with you.
Actually, there are some fantastic rubber (or some kinda material) targets made by I believe Champion that are far better than steel and they last, and last and last. They do not ricochet bullets, and they can take hundreds if not thousands of hits.
As some of you know, I've written in the past, in Gun Week, SOF and elsewhere, about the swine who litter up gravel pits and other traditional shooting spots, especially on public land. They give us all a bad name.
Giving us a better name are people who use retrievable targets and who pick up their messes.
I've got a few of the above mentioned targets and they are the darnedest things I've ever shot at. Several are mounted on large frames so they spin when hit. Others honestly look like big orange or red steel plates. Some look like crows, squirrels, prairie dogs or other small varmints, and they are a hoot to shoot.
In my earlier years when I was just getting started in handloading, I always took a bag with me to such sites and picked up once-fired brass. The places were loaded with spent casings, and that's how I put together a rather formidable supply of empties. It's amazing to me the money that some goofs leave lying around for cheap &%%$%$s like me to pick up and re-use. God's gift to financially challenged gomers like me, I reckon.
Check out such targets. And remind others to clean up their messes.