I like to use mil 5.56 brass to make my 221 Fireball cases. It's not that hard to do and I don't mind speding the time during winter months to make a few. I'm still on my first batch, the things last forever. I've refined my process from what is shown in this link but you get the idea.
http://shootersforum.com/showthread.htm?t=54312&highlight=flashhole 
