I'm not trying o be disrespectful, but to me, the most important part of defensive shooting against one or two assailants is the ability to control your firearm and put 2 or 3 or 4 or 5 or as many as you have "on the assailant(s)".

If you do, the fight will be over 9 times out of 10. Just like the muscular but fat big guy is a 1 of 10, getting into a gunfight is one in ???? and needing FBI spec ammo is kind of beside the point if you don't hit anything if and when it happens.

Train to hit the target under stress, and realize that lots of the hype about self-defense round knock-down efficiency is about selling expensive ammo....Sorry.

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Loving retirement!