I went back and read post #1. At least one company makes a line of dies expressly for cowboy type cartridge reloading. SFAIK, the major difference is in the case belling die for bullet seating. The OP might be well advised to break out the wallet and get a better set of dies more suited for the task. Sometimes you aren't paying for "name", but technical superiority.

The suggestion to use new Starline brass is also a very good one.