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The advantage that the boat tail has it when it drops to sub sonic velocity: the air folds around the boat tail and gives the bullet a push increasing the range slightly.
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I understand how someone might think this happens. But it's kind of the reverse of reality.
The low pressure area behind a bullet "drags" on it going through the air. 'Tis like a vacuum trying to suck the bullet back into it. Hence the exterior ballistic terms "low drag" meaning a bullet with that characteristic slows down less in flight. The word's also used for "drag function" which is part of ballistic formulas used to calculate trajectories for a bullet's ballistic coefficient.