I have seen, in the past year, reclaimed shot that was professionaly cleaned and bagged. I would not hesitate to shoot it through my 1100, 390 or Moss cannon. But my K-80's Parker's LCS ect don't need a couple of random scratches in the barrels.
Also most of it is not round or uniform in size. So shoot it at 16 yard trap, or 12 gauge skeet through a gun that has a replaceable barrel.
bill