I was just tipped off to a new scope coming out specifically designed for the 300 AAC Blackout cartridge. Like similar scopes it will feature both supersonic and subsonic markings on the reticle, but what I really like about this particular scope is that they tell you the complete ballistic profile of the ammunition they used to calibrate the scope. Not even Leupold provides that level of detail. Retail will be around $400 for a first focal plane 1.25-4×24 30mm scope. More info here.