Dies are scratching cases - What happened?
I was going along sizing .270 Win brass last night, when after about 30 pieces my die started scratching the cases pretty badly. I removed the die, seaterplug, and cleaned the die with alcohol. When I shine a light in the die, I can see two small scratches on the side of the die. What caused this? All the cases had been tumbled clean and lubed with One Shot. Nothing stuck in the die. Nothing but brass has ever been in the die. I can't figure how they got sctratched or how to fix them. Any ideas?