1stmar, try full length sizing with a bushing die (no expander ball) and set the fired case shoulder back no more than 2 thousandths. Decap, clean then lube the cases before sizing. And the bushing diameter needs to be about 2 thousandths smaller than a loaded round's neck diameter.
It's not uncommon for some folks to get better accuracy with neck only sizing tools and techniques 'cause of the way the set up and use their full length dies.
Last edited by Bart B.; November 20, 2012 at 12:56 PM.