The Lee mold .575 ball shoots pretty well in my Green Mountain barreled TC Hawken with a .018 pillow tick patch. It takes a pretty good whack on the short starter to start the ball, but goes down fine after the start.
Whacking the short starter by hand is no problem for a few loads when hunting. But shooting a bunch of shots on the range calls for a mallet or I would end up with a pretty sore hand.