ok fellas i'm sure this has been cussed and discussed but i need to know for my specific weapon and needs. ok i'm putting together what i guess would be called a designated marksman rifle. it'll be a colt ar15a4 20" rifle in 5.56mm with a leupold vx-6hd 1-6 with the firedot ret and cds turrets. i'm planning on shooting the black hills 77 grain otm load going round 2,750 fps at the muzzle. i'm also planning on using the adm delta cantilevered mount. the shots will be 600 yards and in. so, what are y'alls thoughts on 0 moa vs 20 moa cant for my needs? the leupold has 170 moa of travel so that'd be what 85 moa up and 85 moa down? my plans are to zero at 100 yds and dial from there to 600 yds. most shots would be 100-440yds with some out to 600 yds thrown in. what say y'all please?

Big Ed