Re: stuck brass
you can screw the expander ball/mandrel loose, and pull it up out of the way (as someone else mentioned).
Then take a drill and drill about a 5/16" hole, all the way through the primer pocket, into the stuck case. (don't let the drill hit the decapper pin, hold all that out of the way)...
then take a socket, from your socket set... about a 9/16", 3/8" drive. Socket has to be big enough for case head to fit into.
Then get a bolt, with threads slightly larger than the hole you drilled in the case head.
Put the bolt through the socket from the square drive end, then thread the bolt (you'll have to force it a bit) into the hole in the case head. The socket will press against the bottom of the die, and as you tighten the bolt, it'll pull the case out.
Put the die in a good vise, padded, of course for this...