It was an interesting article. I liked his premise of the psychological stop vs the physical stop. That makes alot of sense to me in that after one bullet many/most people will decide to stop their attack vs the hardcore that keep coming.
If you watch any youtube video's of convenient store robberies, most I have seen show the criminal disengaging and running as soon as the clerk pulls a gun out. Shot may be fired but from a retreating criminal.
I agree it would be nice to see data covering the different types of ammo (HP, +P, etc).
I often advise people to carry whatever they can control because a miss with a large caliber is worse than a hit with a smaller one.
I would be curious to see what percentage of attack stops are psychological when no hits are made. So how many people run away at even the thought of being shot.