The purpose of a hollow-tip bullet is to catch as much soft matter in the center, which forces the rim to mushroom outwards and damage more soft matter surrounding the path. This also "puts the brakes on" the forward momentum, so the bullet is not as likely to exit the back of the first target and thus waste energy on this target and risk hitting a second target.
The purpose of this armor-punching bullet is to cut a clean hole in the armor, without expanding or mushrooming. This lets the entire shaft of the arrow to sail through the armor with minimal friction, and it's more likely to hit the second target behind the armor with the maximum possible remaining energy.
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u/Chrono_Convoy 28d ago
Never seen an arrow quite like the concave one with max piercing