Same with my Kimber 308. My dial was spot on out to 600 yds on a 6HD. Chrono your rounds, on your rifle, at the elevation you expect to hunt. Look at average temps where/when you plan to hunt. The better the info in, the better the dial will perform for you.Have a bunch of CDS they plain work, buy it and have fun, we were shooting steel on Sunday and the 14yr old would range and dial he was accurately hitting steal at 560yrd with his Kimber hunter in 7-08.