I was once familiar with the details of the Miami Massacre and the problem really was not so much bad weaponry as mistakes in the stop itself. The bad guy who did most of the killing with a Ruger Mini-14 effectively had his heart destroyed by a 9mm round that was fired through the windshield. One agent lost his gun in the stop another lost his glasses and was then effectively blind. Yes, the FBI decided to go to the 10mm as their handgun of choice after that before they went to the .40 S&W because some agents could not handle the recoil but the primary failure was not one of weaponry.
In point of fact give sufficient adreneline a person can function for a minute or more even with a punctured heart. That time can be an eternity in a firefight. He was finally brought down by a round to the head.
Stay well - Stay safe - Stay armed - Yorktown
Don't forget that one Fibbie in Miami ran away until the smoke cleared and help arrived.
It's been awhile since I've seen the tape but a couple of the agents left their vests and 12 guage shotguns in the backseats of their cars.
It aint good to bring a S&W .38 snubby to a gun fight against a guy with a mini 14.
They even knew he had it because the FBI pulled up along side of them and he raised it up for them to see it.
That was ugly.