When I sight in I wait for the day with the least wind, a nice calm day is suitable. Some people like their scopes dialed in at 3 or 2 or 1 inches high on the bullseye at 100 yds. That will make up for bullet drop on those really long shots. Myself, I like the dead on at 100 yds because I won't shoot much farther than that. Just be sure to look at the dial because it tells you which direction to turn in order to get closer to your target......1 click=1/4 inch high, low, left, right- depending on what dial you are adjusting and which direction you turn it. Hope this helps.