Quoted: You still need your HOB to determine trajectories...
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NOT TRUE, the IBZ, which is linked to above by "Sharpshooter" is the #1 used zero for Aimpoint/EOTech equipped rifles, (it is a 50 yard zeroing method).
As stated up front, Zero the rifle at 50 yards and you'll have no worries at 200, depending on your choice of ammo you'll be quite close to on target at 200. Simply fine tune the zero at 200 yards for the ammo your using.
FWIW cube, not trying to tell ya what to do but if your unfamiliar with red-dot zeroing ya really should keep your comments to yourself and READING the question posted will help tremendously toward providing relevent information to those seeking help.
Red dots are not normal hunting or long range type tube scopes and are generally installed at co-witness height, so HOB doesn't enter the picture. Military sighting solutions prevail in this venue.
Mike