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Thanks Brian, that was exactly the point I was trying to make. Unless you are going to resize your brass to the exact dimensions of the modified case, you should instead be taking the measurement from the shoulder(datum) to ogive as the important part. Once you calculate this value (0.57 for you), then you can measure each individual case shoulder(datum) and add this value to your case to determine the perfect OAL.
Note: this assumes the shoulder does make contact with the chamber of course, which is certainly the case if you're using fire formed cases and will be the case with the modified cases as well.
Great explanation, let the accurate reloading begin!
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