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Have come to that conclusion for most of my mid-range cast bullet shooting...will size the bullet to whatever the diameter just ahead of the chamber.
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That is called the throat.
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Figure the bullets are going to become that diameter when fired at this pressure level so may as well start out that size (so long as the case has enough room for a clean release)
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The bullets will swage down as they are forced down the bore, but if they don't match the throat diameter perfectly, gas cutting will lead-up your barrel very quickly. Gas overtakes the bullet in the chamber (7000 FPS v. 1500 FPS) if the bullet is undersized in the throat.