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M&M,
Don't remember for sure, but I think the rifling did leave tiny nicks in the bullet jackets?
Cerrosafe will not help you determine OAL for your reloads. It is great for checking chamber condition, and proper dimensions, but I don't think is was intended to be use for OAL measurements.
I'd still be interested in hearing what you find.
I would not use anything but the actual bullets you are reloading to determine OAL. Even changing to a different bullet weight, from the same manufacturer and type, may effect OAL, because the slope (ogive) of the bullet can vary.
Bill
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