lots of variables as well. irons or scope. depends on the scope as well (bdc or not). then, depends on the distances. did i mention the velocity as well? if every target was the same distance, you might want to change yer zero to avoid holdovers, etc. but most stages have targets of varying distances. and since it's easier to hold under than over, 250 is a good zero if the targets are say 325-400. YMMV, but it pays to know what multiple zero's will do with your setup.