Has anyone here had experience with the 7MM Remington Magnum necked down to 6.5? I would be using it for occasional target shooting and possibly antelope. I understand that it would probably not have the best barrell life. My 7MM needs to be re-barreled and I am already having the trigger replaced. I am also thinking about having it necked down to 6.5 for fun. Would this basically be a 264 WM?