i usually shoot for 2 inches high at 100 yds on 9. all my scopes are 3-9 as well. this might not be as precise or proper as it should but i always check my 3 to be pretty close to dead on at 100 after setting it 2 in high at 100 on 9. ive only taken 1 shot over 200 yds and this has always worked well for me.