Some time back there was a thread on developing a tool for picking up used brass.
It seems the tool already existed for picking up nuts (also there was an expensive comercial machine available)
Anyway here is a link http://www.nutwizard.com/prod01.htm
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From the Shoreline of Erie before the Great Black Swamp was drained
i lay out a tarp so all the brass lands on it then pick ut the edges and dump it in a container. it works for all types of brass, 22's and shotguns too.
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keep the sun at your back and the wind in your face
aka DARTanian
Only problem with that thing would be that for every one piece of reloadable brass you'd find at any of the ranges I shoot at there are 500 pieces of berdan primed, steel cased garbage that you'd also pick up. You'd spend more time sorting the good brass from the worthless stuff that you'd spend just picking up the good brass one piece at a time by hand. For brass recovery, this thing is a solution looking for a problem, IMO.