FWIW:
My shooting group had its monthly shoot at Ben Avery today. Inspired by your post, we ended the session, not with a shoot-off, but with a clean-off.
Shooter starts with a .44 Mag revolver, held in one hand, hammer cocked, finger on the trigger, just as shown in the movie. Shooter says "You have to ask yourself one question: do I feel lucky. Well, do ya, PUNK?" Soon after, the timer beeps, and the shooter fires one round at the head of the target. On the head of the target is a Shoot-N-C four-inch Bullseye. Time limit was two seconds, but everybody fired under one second.
Three of the shooters put the round through the one-inch red bullseye. The one closest to the center of the red circle was declared the winner of the clean-off.
Why the "clean-off"? Because it's the most powerful handgun in the world, and it'll blow your head _____ ___.