suggest Cu tubing, it's cheap and easy to find, when someone took the words right outta my mouth, dirty, unsanitary habit that it is...
If you take the same sharpened case mentioned above, drill a nice CENTERED hole in the head (use the flash hole as a guide) and install a bolt and nut, with however many lockwashers you think you need, you can run that puppy in a drill press. Use a piece of wood for a backer, and you can cut wads all day, pretty fast, too. If you leave out the lockwashers, you MAY have some trouble with slippage, but you can disassemble the unit and use the hole to push out the wads when they fill the case.