Got an e-mail from brownells today advertising the frankfort arsenal stuck case remover. Its interesting in that there isnt any need to drill and tap the case head. Its a small sliding vise that clamps on the protruding case head and pulls it out. The jaws are serrated for a solid grip. It snaps in the ram and is tightened on the case head with a screw then the ram is used to pull the case.
Its an interesting concept that should work quickly and easily.