That BLM land has become my go to spot (not the gravel pit which is always packed, but further out).
I ended up with a steel target that I picked up from a gunshow that has worked out well. I'm going to pick up additional falling targets from Ebay however since there seems to be a good market for targets that can fit into flat rate priority boxes. Someone with a plasma cutter can crank them out pretty inexpensively.
Here is an example: http://myworld.ebay.com/arkcusmfg68?...p2047675.l2559