Jeppo the only thing I can add is what Grammins himself said in the immediate aftermath of his ordeal.
Paraphrasing, he stated that when he slowed down and tried to calm down and focused on the basics - he fired the shot that ended the fight. I believe him.
And today, if he feels he needs that much ammo - and weight - on his already heavy duty belt, more power to him. Those who go out there should have final say on what goes with them.
This incident has been seized upon, for years, by proponents of smaller calibers and multiple high cap mags. They spin it as some kind of "failure of the 45 round to stop the fight". When it was first presented to us in training, it was to point out the value of trying to remain calm and fall back on our training to "work the basics QUICKLY" and end the fight with shot placement. Regardless of caliber.
What was that Granny use to say about a hit in the eye with a 22 being better than a couple of misses with anything else?
Buy and carry whatever you will. But DO TAKE the time to become proficient with whatever you choose. One thing I learned working GSW Homicide cases, you will be out of time LONG BEFORE you are out of ammunition. Whether you are carrying, 7, 9, 11 or 21 rounds. Shot placement and being firstest with the mostest usually wins the fight. The history and statistics of social gunfire, both LE and individual citizens bears this out.
The Grammins incident was an exception - as there always will be. So prepare and train. Learn from it. But don't hold it, or Grammins later decisions, up as an example of something they are not. Regards 18DAI