The Winchesters that I peel are papers, not quite modern, but industrial shells, not original shotshells. First I deprime the shell. I then use a machinist's saw to make a small diagonal cut at the top edge of the second layer. This cut allows a little point of brass to protrude. Do not cut into the main base of the shell. I grip this protruding point with a needle nose pliers and roll it onto the pliers until it is ripped to the rim area. Then everything falls away and you are left with a shell that will fit in a shotgun and takes a 209 size primer. I don't know whether the more recent empties are two layer or not.
