I'm having a 7 08 built and cant find any brass. It wont be done for a while so Im not it a hurry. I have read that I can make my 243 brass into 7mm-08. just use a good lube and run it thru a FL die. any reason I can't? I trust the opinions on this site more then others. I have also heard a 308 can be necked down also but I have a lot of 243 cases.