What sort of volume are you talking about?
For the price, it is hard to go wrong with the Lee hand trimmer.
You need this:
http://www.midwayusa.com/product/476...-and-lock-stud
and these:
http://www.midwayusa.com/product/459...06-springfield
http://www.midwayusa.com/product/321...243-winchester
The only problem is I don't think they make a case gage for the .204.