So Ive been looking into getting into long range shooting and hunting. I currently have an armalite ar-10 in 308 win. Ive been looking at the sightron siii 8-32x56, the sightron siii 10-50x60 and the nightforce benchrest 12-42x56. I have some questions though. On the above scopes which reticle is best, why do most scopes have the elvation and windage turrets as well as mill dots or extra lines, and is it necessary to have both mil dots as well as turrets or is just a cross hair and turrets sufficient for hunting and target shooting. I would also appreciate any ballistics charts or programs that would help calculate bullet trajectories. I would appreciate any help and tips anyone may have.