Just finished reading an article about the new DPMS LR in .260 Remington. Although the rifle was the prototype, the review showed promise of this cartridge used in this platform. Since the .260 is based on the 08 family, conversion for the AR10 would only require a barrel swap. Really like the idea of shooting the high BC 6.5mm bullets. Brass is readily available too.
Wonder if John Noveske has the time to make me another barrel as the .243 Winchester barrel he made is a 1/2 moa shooter with 107 gr SMK @ 2950 FPS 10 feet from the muzzle.