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dider, Be it right or wrong this is how I have been doing it.
1). make a dummy round either by using a fire formed case inserting the bullet of your choice and LIGHTLY mashing the neck so that the bullet will slide but not fall into the case, OR, You can use a full lenght sized case and make a cut on one side of the neck with a hack saw, This will alow the bullet will slide with some pressure.
2). Push the bullet into the neck enough that the neck will hold the bullet ( 1/2 the bullet diameter works for me ) color the exposed portion of the bullet with a permanent marker.
3) Slowly chamber the dummy round , the bullet will come into contact with the lands and slide back into the neck . Eject the case, if the bullet sticks in the lands you can pop it out with a cleaning rod. The case will scratch off some of the permanent marker . This is how far the bullet moved into the neck re-insert the bullet back into the neck of the case until the scratches are even with the end of the neck. I use a bullet comparator to measure the length. I do this a few times to verify a good measurement .
4) Now use the bullet comparator to measure your loaded rounds . Subtract this measurement from the measurement taken in step #3 . The difference is the distance from the ogive to the lands.
Hope this helped ,
Mike
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