Penetration is a critical aspect of terminal performance. As the great African professional hunter and gunwriter Finn Aagaard once wrote, “Killing power is a matter of biology, not math and physics, and is influenced almost totally by shot placement, accompanied by sufficient penetration.”
Think you know what the best defensive caliber is for your personal-defense pistol? These numbers might change your mind about ballistic effectiveness.
Many gun gurus consider .380 ACP to be the minimum personal-defense caliber, but what about guns available in .32 ACP? Here's some background on the numbers behind this micro self-defense round.