It is to make them more accurate. It disperses the weight differently, and the HP fills with air in flight and makes its own "Bubble" of disturbed air to travel in. Normslly HP bullets are longer and have more bearing surface in the barrel as well, which helps with stability
Quote Originally Posted by ROB View Post
Why make a HP that doesn’t expand?? Not being a wise ass, just trying to learn more about pistol ammo.


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