If target shooting 600 to 800 yards- I have to ask--Why mil dot?. I shoot 600 to 1000 yards with a 8-32 x 56 Sightron. Get one with fine crosshairs and you are set. Tracking is dead on , no need for mil dots. Extra junk to clutter a scope
Vortex are great scopes but for the same amount of money you could get into a Sightron 8-32 x 56. More magnification, You get out to 600 yards and more,you will wish you had more than 24 power.