The BO was marketed to shoot super and sub from one gun. Leupold's dual reticle is calibrated to both since the drop is significantly different between the two. The 6.8 is primarily a supersonic cartridge only and doesn't need it. Well, until Bison's BSP's start hitting the scene. Those might be 6.8's that benefit from the dual reticle.
I however think it is a needless complication and creates a busy sight picture. That is 16 aiming points for elevation alone. Doable with practice, but so is holdover or adjusting turrets.