OK, I've got my groups to .7-.8 moa at 600 yds and I've done everything except check for run-out, (which I dont have the tool for yet) and weigh cases. I want to tuck them onto .5 moa thereabouts before moving out to the 1000yd marker. What tolerance is acceptable in brass. I just weighed a bunch and theres bout 7gr. high to low. How do I group them?