If you plan to do a good bit of forming, give David Davison, with CH4D a call , (740)397-7214 , and discuss with him what you want to do, he can fix you up with a set of case forming dies that would make the job a lot easier and with a better success rate.
Dave knows dies and how to make them , nice guy too.
Oger , I think Dave may also have a die to take care of that problem ...give him a call.
Gary