Yeah, I'd love to find something that would work like that, and some of the places I "mine" for brass, it just might.Just a suggestion. If you are wanting to pick up brass without breaking your back or messing up your knees ... take a look at some of the little gizmos that are sold for picking up pecans. I have one that works perfectly w/ shell casings. It is so old I can't read the name on the handle. But it's a little round wire basked thing that you roll back and forth. It picks up pecans ... or shell casings very nicely. Much faster than fiddling around picking them up one by one. Sincerely. bruce.
Unfortunately, the range where I made this haul, one of those birdcage-on-a-stick thingies wouldn't work. It's a gravel pit complete with every size of broken rock from pea gravel up to fist-sized, and for every piece of brass on the ground there are probably five steel cases and two or three shotgun hulls.
So far I haven't been able to figure out any method that works other than the old fashioned bend & stoop. I wish I could come up with something else. My hamstrings and the muscles in the small of my back are still a little bit sore. But it was worth it.