I have an interesting problem. I bought 300 ea of Lake City brass in 308. I reloaded it with 150 gn Hornady bullets. The problem is the rounds won't chamber in my Garand. My micrometer tells be the base of the brass just ahead of the rim is about .006 thousands too big as if the brass has stretched. It goes thru my resizing die without a problem but still won't chamber the last 3/8 inch of the round. The neck diameter on some of them, but not all, is .003 too big. I thought LC brass is thicker and therefore has less tendancy to stretch. Any ideas or suggestions would be appreciated.