Carrying on the tradition of my favorite opinionated instructor he presented this information in class:
The title of the study was called: Winning Officer Gun Fights (or something like that. I Googled it and it did not bring up a study.)
Some education type gathered up the all data from literally 1000s of gun fights and in the "average" winning gun fight, these were the relevant facts:
Distance was about 10 yards
Approximately 12 rounds were fired by the officer
50% hit ratio
NOTHING was mentioned about caliber.
On the other hand, in an officer killed scenario, the relevant facts are:
Distance was about 7 yards (this might be 7 feet. I did not verify that.)
Approximately 2.5 rounds were fired
25% hit ratio
Hmmmm. With 2.5 rounds fired with a 25% hit ratio means 0 rounds actually hit the bad guy. Again, there was no mention of caliber.
Say what you will about your favorite caliber, but these studies shows that in a gun fight, the caliber of the gun played no statistically relevant part.