I usually like to play sniper style in any gamemode i can find in the arma enviroment, but i noticed even tho i set up the zeroing perfectly sometimes the bullets doesnt go where they should go

Today i was on a king of the hill server and i sat around 1.2km away from the middle tower, i set my zeroing to 1.2k and the bullets from the lynx hit 1.5 milidot over the place they should had hit,

i retried with other sniper rifles and they hit where they supposed to