I and several of the guys I hunt and guide with have Leupold 6.5-20 or 8.5-25 VXIII 30mm tubes mounted on .300 & 7MM RUM's, one of the guys shoots the 30-378. The dials are right on. All of us are having great luck with these guns in competition shooting and pack them out in the field. I think I was the most skeptical about trusting the target knobs until watching these guys make some amazing shots over a couple years. More and more people are showing up at our money shoots at ranges to 1000 yrds with the same setups after seeing whatwe are doing. PM me if you would like to try taking some of our money, I'll let you know how to get here.