How is the best way to measure bearing surfice ?
Get two bullet comparators of same caliber. Clamp them to and line them up best you can on the calipers. Place a bullet in the comparator either point down or up, just make sure you're consistent with them all, either up or down and take a measurement. Not rocket science, just time!
I don't have a problem with consistency. I've been using Starrett calipers with Davidson comparators for a few years and have measured my share of bullets. I have one of John's Ogive comparators and use it occasionally. I find it to be no better than my caliper/comparator combo.The problem is "consistency" with hand held calipers. If you are serious about it, get the Buhay Ogive Comparator. Consistency issues are gone. I know I have used the handheld and then run the bullets thru Johns device and the handheld was all over the place.
If you are serious about it, get the Buhay Ogive Comparator.