I dont have my old ballistic software handy, but after i worked it up originally (1993 or so) i sightin at 100 yards at 2 1/4 inches high on the iron sights, but different bullet coeff's could change that.
there are several decent ballistic programs out there for free or cheap.
they can get you close enough to cutdown on a large part of your sightin.
borescope it, run ballistics, then finetune at the range.
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