Using a RCBS micrometer to measure oal to ogive , I imprint a line using extra force onto a dummy round, this marks the oal to ogive reference. Then I take same dummy round and measure with a hornady comparator body in my calipers. Well the line I made with the mic is well above what the comparator shows. Has anyone else noticed this and might I add, if you make measurements with differing tools for one rifle, do not change measuring technique, you may get crossed up with the numbers. I did measure the inside diam of a hornady .257” bushing (comparator) and got .250”. I’m guessing this is a safety measure or am I missing something?