ORIGINAL: ShatoDavis
I don't guess I see the problem. Your reloaders manual shoud state the "trim to" length. The shell holder is the same as the 222 mag. I'm not fimiliar with the Lee case trimmer so maybe I'm missing something. T
The guy has one of these cheap jobs you stick in the drill. And they don't have one for a 204 yet.
my suggestion is to get a real trimmer. Buy a RCBS pilot for a 204, and trim.