I did mic the case just ahead of cartridge case head before firing and then would check them as I worked up. The thousands of difference is one indicator along with flat primer and bolt lift. I also agree that velocity it an indicator. Didn’t have that at 47 gr of Big Game. Maybe future loads I should back off 2/10 gr and see if that brings it closer to 2900 fps. I find that a lot of people that reload don’t shoot over a chronograph while working up loads.
I have no intent on making my 7mm-08 into a .280
