I believe there was a 6.5 MPC round a couple of years ago. Literally a 5.56 opened up for a 6.5 bullet. I read an article about it, but then it seemed to drop off the map. Using all of the same equipement, and only needing a new barrel, it would seem to have a lot of promise. I would like to see how fast it could push one of those 90gr TNT loads. FAL
