I don't get hung up on being at lets say exactly. Also if you tighten the comparitor body onto your caliper arm too much it will actually cock the comparator off a little bit. If you take a measurement and then spin the cartridge a little and repeat you will find that you can sometimes get several different measurements that vary by a few thousandths. In my experience I have found the Hornady comparator gauges aren't the most consistent things in the world. base of the case) to bullet contact point in the die (which should be bullet shoulder) should be a constant, and any difference in bullet length or case length just results in a difference in how much the case and bullet overlap, not in a difference in the cartridge overall length. However, I'm trying to figure out how a variation in bullet length-to-ogive would matter - if the two contact points when seating a bullet are the press ram at the base of the case and the die at the bullet tip to shoulder pressing the two together (i,e, you're holding the bottom of the case and the top of the bullet and squeezing them together), shouldn't any variation in bullet base-to-ogive just result in a variation in how far down the base of the bullet sits in the case, not in a difference in the shoulder-to-cartridge-base distance? I'm thinking that the ram (i.e. I just measured six bullets, and the length to ogive was 3 at 1.075, 2 at 1.065, and 1 at 1.060, so there is some variation there.
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