John, I've been waiting for your update. This thread caused me to get a button resizer for the 270Win., 7x57 and 30-06. I haven't sat down with it yet though. Reading about your experience, I wonder if an improperly machined shell holder couldn't also be causing the problem? Maybe it is "presenting" the case slightly off angle? An experiment I am thinking is to measure runout for 10 cases and record it. Full length resize with the new button tool and measure the runout. BUT, index the cases position with a felt tip marker before removing them, re-size them again now only 180* rotated and measure. In that way the shell holder would be holder the case different. Something I am going to try as time permits.
