Shot placement is SO much more important than caliber.
That is a fact.
In a shootout where you and the badguy are both moving and trying to KILL each other, shot placement is the first thing that goes out the window.
In a combat situation, the ability to accurately "place" shots is very difficult to do. Sure...anyone can shoot the center out of a B29 silhouetter and think that they are good to go, but the reality of is that when someone is shooting at you "shot placement" is way down the list of things to do.