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"Wouldn't the same air vent holes become hydraulic vent holes the moment the bullet penetrated something fleshy or liquid? Rendering it less effective than one without holes?"
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It's intended, based on the 90 degree angle, that resistance during transition from air-to-tissue, that the holes are plugged, allowing the cavity to pressurize.
Any tissue-bleed into the ports would be irrelevant.
Remember, after the cavity is filled, the ports 'job' is done. The ports only exist for that first inch of penetration.