There's a well documented shootout in 1986 Maihat cost many law enforcement lives that set the stage for 38 Special being lumped into the description as underpowered for a law enforcement handgun revolution and "black" semiautomatic carbines in patrol cruisers instead of shotguns.
There's no question these perpetrators having body armor prolonged their ability to continue their fight.Yet training to shoot for center of mass was retained even through the Biden administration. Adaptability is what ultimately saved that day.
One synopsis of that event.
https://en.m.wikipedia.org/wiki/1986_FBI_Miami_shootout
It is NOT accurate to say the conclusion of the 1986 Miami Dade shootout was that 38spl was underpowered for law enforcement. On the contrary, the performance of the 38spl load used by the FBI (158gr JSWC at 950fps) was used as the benchmark during the testing that led to the adoption of the 10mm. The correct takeaway from the Miami dade shootout is that the FBI needed to issue semi-automatic pistols that enabled higher capacity and faster reloads.
Indeed, that the massively more powerful 10mm offered almost no terminal advantage over the 38spl load in the FBI gel block testing was why the full Norma spec 10mm was deemed overpowered and to have excessive recoil. Thus, the FBI downloaded the 10mm to 950fps— the same speed as the 38spl. Only with the heavier 180gr bullet.
The FBI never adopted full power 10mm. It was downloaded to “FBI Lite” spec during preliminary testing and the FBI never issued any 10mm ammo that was more powerful than what modern 40sw ammo is. In fact, most 180gr loads in 40sw today are actually slightly hotter than the 950fps spec of the original “FBI lite” that the 40sw was supposed to replace.
Original Norma spec 10mm (1200fps at 200gr or 1300fps at 170gr) is very stout. No wonder the FBI downloaded it. Alas, the reason the 10mm “won” the contest for the new FBI pistol against the 9mm and .45 was that 1) the 10mm being handloaded and downloaded, they could “teach to the test” and make it just powerful enough to win the testing, 2) The FBI felt the 10mm being new had more development potential than either of the other rounds which were already 75+ years old at the time of the testing.
The advantage in terminal ballistics that the 10mm showed relative to 45 was very minor, and considered small enough to be within the margin of error. It was the belief that the 10mm had more potential that ultimately gave it the edge. It helped that the common pistols in 10mm also held another round (1911s loaded in 10mm had a std 8rd capacity vs 7 for the .45s).
The FBI’s logic in downloading the 10mm was vindicated years later when they went back to 9mm because the lighter recoiling modern 9mm loads still “met the performance requirement” (which was to be as good as the old 158gr FBI Special load in 38spl).
A modern 9mm pistol offers the same terminal performance as a 1980s 10mm. Only it does it with much less recoil and higher capacity.
That’s what progress looks like in this space.