I think it's time for us to revisit the mesh tarp idea. We gave up on solid tarps after a couple of range trips; either the wind blew them all over the place or we would trip over the stakes.
The problem is that given the nature of action pistol and differing distances plus movement, we would need a bunch of tarps. And then what's the probability they would be in the right place? There is also the issue of ejection distance. Different guns, different pattern/distance.
OTOH, it's a pain in the knees and back to pick up 500 rounds of brass. Even if we only captured 80% of the brass with the mesh tarp(s) it would be satisfactory.