I started having problems with measurements being inconsistent using the Hornady tool. I believe in my case it may have been due to erosion of the throat during use.. I studied a suggestion I found on the Nosler website. As a result I have been more satisfied that I got more consistent results. For what ever reason, it appears to me that you are seating too deeply. I do continue to use the comparator tools to measure the CBTO( cartridge base to ogive )