Im considering one of leupold CDS dials set for my loads data. They ask for average temp and altitude. While using JBM's calculator I can only affect my bullets trajectory by a few inches at 500 yds(changing weather conditions). I really need fast adjustments and have access to a vx-3 w/cds dials and a few inches(3 or less) of error would be fine for my hunting use. Anyone had any luck with these dials?