From a paper by By Massad Ayoob

A municipal police sergeant in northern Illinois, Tim Gramins, comes to mind. He pulled over a heav-ily armed suspect who came out shooting, and the fight was on. In just under a minute, the perpetrator was finally down and dead. During that time, Gramins had fired 33 rounds from his Glock 21 pistol, reloaded as necessary and hit his opponent 14 times with 230-grain Gold Dot .45 bullets. Six of those hits were in what most of us would call “vital zones,” but he fight wasn’t over until Gramin finally had the opportunity for brain shots. During that fight the suspect had gone through two semi-automatic pistols himself and had fired 21 shots. - See more at: 5 Gunfighting Myths Debunked By Massad Ayoob

That would be at least 6 reloads if a revolver would have been used ..