According to Head's Bunker, if you zero at 50 yards, you'll have the same POI at 150 yards, and you'll deviate less than 2" at any point out to 200 yards.
You could also zero at 200 yards and be I think 3.5" high at 100.
Even 7.62x39 dosen't drop much out to 200 yards. It will drop 10" at 300 yards and 41" at 400 yards if you have a 200 yard zero though.