I like to know if someone can let me know about my friends M1 Garand .When I try to size the brass that was fired out of it. Use the 30-06 sizen dies . the brass seams like it is over size not able to size them like I do out of my Rem 7600 30-06. It is factory ammo to start with. Wanted to reload it but not able to size the brass. Did load the ones I was able to since it was shot in the same gun. Is the chamber worm out on the rifle ? He got it from CMP .