What's the case length? I love the idea/ballistics, but if it's not usable in a repeater setup, I'm not so intrigued. I mean....big case go boom. No secret, lots of slow burning powder behind heavy bullets in long barrels will give great velocity. As far as overbore notion, it's probably no worse than a 7mm rum, or 26N/26-300Bee. It should do 500 rounds fairly easily. I think I'd go with a 30XC or enabler and be able to run cheytac mags.