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I am assuming that the bullet needs to be seated so as to use all the bearing surface of the cartridge neck as possible, yes?
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No. The bullet needs to be seated only deep enough that it doesn't fall out. The 30-06 M2 ball load did not use the full neck, and millions of Garands cycled that load just fine without the bullet coming loose, but a crimp and sealant help out in that load.
Jimro