Jeff Cooper did an analysis of that fight (The Great Miami Shoot Out he called it) and of course blamed the 9mm ammo, in particular 147 grain 9mm Winchester Silver Tip hollow points, which I believe was standard FBI issue at the time. One of the bad guys soaked up several of those and was still in the fight.
The bad guys also had semi-auto rifles, against the FBI's handguns. Brings to mind the saying that the only good use for a handgun is to fight your way back to the rifle you should have had to begin with.
David Soul starred in a pretty good TV docudrama about that incident. It's a pretty decent movie and pretty true to the facts, as I recall, if you can find it.
The 9mm Winchester Silvertip was blamed because it stopped just short of Platt’s heart after it went through an arm. But no one blamed the .223 for round for stopping short of Agent Mireles’ heart after it went through his forearm.