I've been using this tool for many years and have removed the crimps from thousands of 5.56 and 7.62x51 brass. Never a hiccup. I just finished 1200 5.56 cases.
If I was having problems, and couldn't set up the die so it's at the sweet spot, the first thing I would look at is the swaging head. I would get another from RCBS.
Safe Shooting!
Steve Redgwell
www.303british.comGet your facts first, then you can distort them as you please. - Mark Twain
Member - Professional Outdoor Media Association of Canada