The .270 AR is for the AR15 , not a long action round.
It's designed by Harrison Beene from AR Performance, the guy that fixed the problems with the 6.8SPC that remington messed up.
It's an incredible round for an AR15 size gun.
In the fall of 2013 we will introduce the 270AR, a .277 caliber cartridge capable of propelling the wide range of great 130gr 270 bullets to 2800fps out of AR15 20" barrels. It is based on the 6.5x47 Lapua or Hornady 6.5 Creedmoor.