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What you "want" is something that will stop the threat!

The best way to do that is to use something that will deliver significant energy to the threat. There is plenty of studies about the physiological reactions to being shot. In almost all of them it shows that the body goes into an adrenaline surge when hit by a bullet, even a rock. This surge gives a sudden burst of energy that can increase the threat rather than reduce it. You need a round that will overcome this surge with enough energy to physically stop the threat.

The most effective rounds transfer a ballistic shock by effectively transferring the energy of the round to the body. This means one, that there is some energy, and two, that energy is not lost by the round exiting the body. A round that has exited the body did not transfer the complete energy to the body.

So, you want a round that has energy and is designed to not leave the body, if your purpose is to actually stop a threat.

In my opinion a .380 is not the best choice. In fact, a 9mm, up until recently was considered iffy. Now it is generally agreed that 9mm is fine. A well designed 9mm in an accurate gun is a good choice.

I use .40 cal. myself.

tex