What is the difference between the 6.5-06 AI and the 6.5-280AI? I always thought that the 280 was just a necked down 30-06? I decided, with the help of several ppl on here, to do a 6.5-06. So I kept reading on trying to decide between getting an AI or not and I saw the 6.5-280AI (RCBS) pop up a couple times. I did some looking around and can't find anything on it. Can someone please educate me on this?