Just to be clear, I was under the impression that he fired 10 rounds because that was all he needed, not that he ran out. Did you see something different?
I am curious about the gun he used, but isn't that important. I think I will start carrying a gun with a red dot soon. I need to make sure I check it out at 50 yards. At the least, it will help me dial in the red dot better than I could at 15 yards.