I have read most of the threads that cover this topic. So figured I'd give it a try. My problem is that the .277 cal insert for my comparator tool doesn't come up the the crease at the boat tail of the bullets. Is that the way I should go at it or should I use the .277 on the top for ogive and the.284 for the boat tail? The .284 seams to come just a hair past the crease. It is closer to it than the .277. For got to mention that is a 270 win. As an aside I did sort them base to ogive already. I have 3 piles in .005 divisions. the bullets (135 smk) had a variance of .015 over 150 of them. Should I sort even further? Like every .002 Base to ogive?