Re: Help needed on measurement techniques
I no longer do this, too many headaches!
I used to measure bullet run out adjacent to the tip on HP's and behind the tip on SP's/BT's.
I used to measure neck run out in the forward third of the neck before seating bullets, and the same spot after seating bullets.
You must be sure that you're measuring above/on the bullet shank, behind it will give you erroneous readings if it's a long neck and a short bullet.
Both readings should be no more than .002", .001" was my limit for long range work, but most of my cases would show less than 3 tenths run out on my target rifles.
Some of my hunting rifles would show more than .005" of bullet run out and still shot very well.
I never actually checked neck run out or neck thickness on my hunting rifles, because I never intended to neck turn them anyway.