I noticed that I get different results from my Stoney Point Gauge and have always put it down to human error. Recently I was trying to adapt a 7mm-08 case to fit and, predictable without tapping, it wasn't working well. I tried using a fired case, putting a drop of superglue on the inside of the neck and slipping a bullet partially in then closing the bolt on it. After 5 minutes I took out the cartridge and checked the COL. Just for curiosity I tried the same thing with a .308win round - having already checked and noted the COL the gauge gave me I found that there was a reasonable difference. The glued in bullets came out shorter, from memory by something like .1mm or so. I can and should check the exact discrepancy to post here, but has anyone else found the COL gauge in question to be a bit iffy? I believe that the problem comes from the amount of force you can apply to the case in the chamber. With the Stoney Point gauge you cannot ram the case properly into the chamber. Closing the bolt on a round obviously sets it propery in the chamber and can give a more accurate reading. True?