I bought some new Remington brass. My last brass was once fired factory ammo. I neck sized and reloaded twice. After being fired three times, some of them got a little stiff going into the chamber, so I full length sized after third firing. Of course I set the die just like the instructions said, slight cam over at the top of the stroke. I think that's a little short for my rifle. I got case head separation on the fourth firing. I went and bought some new brass and thought I'd try fire forming to get a little more life out of them. Of course I will double check my die setting before I full length again.