madang55 wrote "Supposed to be 1.8" high at 100 and zero at 200", yeah mate, that's how you should have sighted it. By sighting 1.8" high at 100, the bullet will travel on an upward trajectory path that should give a 200m zero on it's way back down. By sighting in for zero @ 100, you put the bullet on a downward trajectory from the get-go.
If you want a rifle to shoot out further than 100 without hold-over, you have to sight it to print high at 100, no matter what cartridge you use. The higher it prints at 100, the further out the zero. Do some reading on " maximum point blank range".
To use the potential of the Grendal, using data for the 123gr bullet travelling @ 2450f/s, sight it 2.5" high at 100 yards for a useful 200 yard zero and a drop of about 4" @ 250 yards. In use, for anything the size of the deer you are chasing, out to 250 yards, you just put the cross-hair in the middle of the vitals and pull the trigger.