Been looking into Smith Carbine cartridge casings. I have found the brass, the orange plastic with the brass touch hole, and two types of the common rubber/plastic black jobs. What I am trying to find is a place to get the high power metal ones that appear to be some sort of stainless/silver looking things. Any notions where these come from? You NSSA guys probably see them at the shoots!

Further, have any of you attempted to make/use the cardboard/foil ones?