I started having this exact same issue a couple of weeks ago. I have been loading 38SC since about Oct 06, starting with new starline brass and only reloading my brass that I pick back up. It is only happening on reloaded cases, not brand new brass - I have verified that there isn't anything wrong with the brass before station 1 (decapping/resizing), and that the crease is being created in station 1. It doesn't happen with every case, but often enough (1 out of 10) to be disconcerting. I'd say the max # of times that any of my brass has been reloaded is < 5, and I've never seen any signs of stress or fatigue.
I have a Dillon XL650 (purchased new in Dec 05), and I'm using Dillon dies for everything except for a Lee Factory Crimp die in station 5. I've made sure cases are lubed with One-Shot, and the decapping/resizing die is spotless on the inside. I'm going to put everything back together tonight and make sure that the die is resting on the shellplate, and tightened while there is a case in it - but I was told today that I should just buy all Lee dies, and an EGW U-die and I'd be fine. Just curious to see how Joey or anyone else has resolved this issue.
Thanks
Rhonda
