I just wonder if it would make more sense to take a 204 Ruger reamer and run it in far enough that a 223 case could be sized to fit. The Practical seems a little short in the neck to me.
Maybe grind down a set of 204 dies?
I am getting a 204 custom reamer for a conventional re-do of a problem child Ruger 204, maybe when I am done with that I will conduct the experiment on another rifle.
