IMHO any typical deer caliber in a non dial or hold situation should be zeroed(that means on at that range not high or low) in all but the most peculiar situation at 200-250y.
This will put you bang on at typical bush ranges also.
No more than 3 inches high worst case at 125 (7.62x39?)
Point and shoot to 300, if it looks a bit far aim a bit higher !
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