I have been using that same set up for over 30 years and never have had a problem. I would like to know how it happened? I am not criticizing but how did he burn both hands ? One hand needs to push the handle down to put any kind of pressure on the primer. If a primer went off while seating it the sparks would go through an empty case while the tube is out of the way. How a primer went off inside the tube with enough pressure to do that while both ends of the tube are open ? Hope he gets better and please let us know how it happened so others don't make the mistake