Savage Arms introduced a new AR rifle chambered in .224 Valkyrie, developed by Federal Ammunition. The caliber is geared for shooting 1300 yards and more and is based on 6.8 SPC case necked down to .224 caliber. It tries to be like 6.5 CreedMoor with shorter case and less recoil.
MAC also covered this round with 22plinkster
From: Federal Ammunition, Savage Arms, Military Arms Channel