Has anyone seen a marked difference between using RCBS and Redding dies in neck runout? I am considering switching to Redding bushing style dies due to sizing induced runout when using RCBS. Prior to sizing, my cases are showing less than or equal to .001 neck runout. After sizing, it is in the .003 - .004 range consistently. I have tried removing the clip from the ram in order to let the shellholder float but it returned no improvement. I have also tried sizing very little at a time while rotating the case until the neck is fully sized with no improvement. Yes, I'm a perfectionist but I understand limitations of equipment. It is however frustrating to have almost no runout prior to sizing and a lot afterwards.