What I do is set up the rifle , my setup is rear bag ( bunny ear type ) and bi pod . Position croosshairs on the target , 200yard range and parallax on scope at 200 . Get the proper eye relief through the scope and without moving the position from cheek pressure , I do the same as you up and down and side to side , most scopes are very close . I do this at the range when you know for sure the distance matches the scope markings. Right eye relief ( sight picture ) is important too. How much movement are we talking in both up & down and side to side .