Im loading on a MEC Grabber light 12 ga AA hulls 7/8 oz with correct CB wads, measured shot and powder. Loading Alliant extra-lite powder. Chrono the load 12-1210 fps. My once fired loads are absolutely perfect! My second and third fired reloads look great off the machine, but i noticed yday that some of the crimps bulging when i take them out of the container later to shoot them. Is this just hulls getting weak or could I use a little xtra precrimp for the older hulls.