The Leupold Mark AR Mod 1 with a duplex reticle has an MSRP of $375. I wouldn't be surprised if it couldn't be found retail for very close to $300. It's elevation turret is marked for a 55gr .223 load, but it also has mils on the turret as well. A mil-only turret can be had for $36. It has an adjustable turret on the windage as well. I'd play with that at the range, but would put a wrap of electrical tape on it for hunting.
http://www.leupold.com/hunting-shooting/scopes/mark-ar-riflescopes/mark-ar-mod-1-3-9x40mm/
http://www.leupold.com/hunting-shooting/scopes/mark-ar-riflescopes/mark-ar-mod-1-3-9x40mm/
