I was waiting for somebody to use the phrase "rattling down the bore" in regards to 9mm in a .357 revolver. A difference in diameter of .002" does not lead to a bullet "rattling" down the bore, there is no rattling at all because the bullet is in contact with the lands, which are cutting the rifling and imparting the spin on the bullet.
The bullet doesn't obturate to the largest diameter of the grooves, but there's no moving or rattling due to the contact with the lands.
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