what frank said, also remington decided to try and rush a cartridge through without enough R&D. They had the twist rate all wrong and it performed very poorly. Fucking Remington.....
I would have loved to have had a 6.8 rd versus 5.56 many of times over there. A lot more kinetic energy behind the 6.8. Puts people and Hogs down quickly!
Plus all that surplus ammo Makes me wonder if they did make the 6.8 standard issue would the 300 blackout ever been invented?