Most of the answers you've gotten are overly technical. Some of them are chock-full of false information. And none of them really answer your question.

The honest answer is -- as long as it is a hollowpoint bullet and it shoots accurately and reliably in your pistol, you're good to go. Any bullet weight from 95 gr. to 147 gr. will work for you. Forget the velocity, and all the claims as to which defensive bullet weight or style bests the other. Reliability, accuracy -- that's all you need.

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Pisgah