In my post below I described having issues with trying to get my new Cooper in 7mm-08 to shoot. I've only shot new brass but have noticed some rounds show a bit more resistance chambering than others. On a whim I decided to measure the headspace with an RCBS precision mic. I realize these aren't the most precise tool to do this but it's all I have. What I found is that some of the new brass is actually about 0.001" - 0.002" too long. I find this to be somewhat unusual as I've seen factory rifles with too much headspace but never one with not enough. Most of the new brass measures the same or a tad more than my fired cases. Do you think this could be the cause of the so so accuracy I've got so far?