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Message: <blockquote data-quote="rocketman" data-source="post: 3984171" data-attributes="member: 24956">You're welcome! This kit was designed for use with the Hornady O.A.L. tool shown being used in the picture.  I highly recommend getting that tool as well.The number you measure with the comparator will be for comparing cartridges only and won't be found in a book anywhere. You will pick the closest size insert that touches at the ogive or ideally where the bullet would touch lands. Hornady tried to make all the inserts the exact same thickness but there may be variables with manufacturing tolerance. I highly recommend zeroing on the comparator tool and not on a closed caliper. For this, I also highly recommend a digital caliper.</blockquote>