I neck sized some .308 win cases three times and all was well, but I decided to full length resize on the fourth reloading and I could push the bullet in the case mouth with my hand after resizing. They were not hot loads and the primer pockets were still tight as new. The cases are Winchester brand and I have never encountered any problems with their cases in the past. Its hard to believe the cases would be work hardened after only three loads. Does anyone know why this would happen, or how to correct the problem. thanks! :?