I had 50 rounds of RWS brass once fired. I checked the runout of the empty cases on my RCBS Case Master and all 50 rounds measured no more than .001 runout. When I ran them through the redding bushing die(with .332 or .331 ) the very best were .0025 with the worst being .006. Im still a novice reloader but I can only come up with two possible issues. 1 either the cases have .0025-.006 difference in neck thicknesses or the die is causing a problem. The rws has a great rep for being second only to lapua as far a quality so i think it is the die. I have removed the expander ball. the fired case measures .340 the sized case measures .331 to .330, is this to much in one step? Any ideas?