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I zero at 25 yards. That puts me at one mil dot up at 50 yards, back to zero at 100 yards and two mil dots low at 150 yards. seems to be the most usable for my purposes.
as suggested, I like the 25/100 coincidence (mine isn't exact so I do zero at 100). I also use see-thru rings...anything under 25 yds I hit with open sights. Anything further I use the scope.