You know how when you have been doing something for so long you forget the simple things? That's what I did. The trick of setting your brass in a pan of water leaving the case mouth exposed above the water then heating up the mouth to make the brass softer. It works. I have some .357 brass I have reloaded for 20 years. I had to heat the .308 brass from top to bottom but it goes in the sizing die with no problem. I have never seen brass this hard. The brass is marked with an LC 14 and has a cross inside of a circle. Any way that did the trick so now I'm going to find out what I can about who makes the case.