MN.Militia
Professional
You forgot this Magnum...
10mm vs. .40: Was the FBI Wrong (or Right) About This?
- Thread starter Mike H.
- Start date
10 mm full house is about the same as the .41 mag which was designed to be “the” Police cartridge. Both failed to take off because of recoil management issues by the intended audience, though both are. Pretty decent rounds. If you’re not using full power,then the .40 makes perfect sense. I do not understand backing even that off to 9 but that’s the way it works. If I was knowingly going out in harms way I’d want The most powerful round I could shoot accurately
HayesGreener
Ronin
The .357 was developed at the request of FBI in the 1930's for a pistol cartridge that would defeat WWI era body armor being used by bandits. Other magnum handgun calibers were developed by and for large men who were looking for power and were not recoil sensitive. Many hunted large game with a revolver. Those developments were noticed by law enforcement agencies that were looking for better man stoppers. NIJ studied the effects of various handgun calibers in the search for a better manstopoer.in the 60's and 70's. The magnum guys pushed magnum calibers, and even a 10 mm, but we always hit the same problem-getting novice recruits qualified on heavy recoiling handguns. Some departments like San Francisco issued magnums to recruits for training but the recoil problem was a barrier.
After the FBI Miami shootout FBI wanted to blame the gun rather than poor tactics. They needed a BIG GUN to prove the point. Some of the most knowledgeable firearms trainers in the world are at the FBI training unit at Quantico.
Some senior folks wanted to adopt the 45acp but higher ups wanted the 10mm. Of course recoil and gun size and weight got in the way of recruit training so they downsized to .40 S&W. Many policce departments around the country jumped on the .40 cal bandwagon. .40 cal is still a little snappy. After about 15 years FBI studied the problem again and settled on 9mm. They justified it by citing improvements in bullet design and performance. They also noted the recoil of .40 cal reduced gun life due to wear, and the cost of .9mm ammo was much less than .40 cal. There were still some pretty knowledgeable folks who would have preferred .45 acp. The FBI HRT still uses a 1911 in .45 in the SA Professional.
I am of the opinion that cost of ammo and guns was a guiding factor for the decision to jump back to 9mm, but I have to say some good 9mm defensive rounds came out of the whole process.
After the FBI Miami shootout FBI wanted to blame the gun rather than poor tactics. They needed a BIG GUN to prove the point. Some of the most knowledgeable firearms trainers in the world are at the FBI training unit at Quantico.
Some senior folks wanted to adopt the 45acp but higher ups wanted the 10mm. Of course recoil and gun size and weight got in the way of recruit training so they downsized to .40 S&W. Many policce departments around the country jumped on the .40 cal bandwagon. .40 cal is still a little snappy. After about 15 years FBI studied the problem again and settled on 9mm. They justified it by citing improvements in bullet design and performance. They also noted the recoil of .40 cal reduced gun life due to wear, and the cost of .9mm ammo was much less than .40 cal. There were still some pretty knowledgeable folks who would have preferred .45 acp. The FBI HRT still uses a 1911 in .45 in the SA Professional.
I am of the opinion that cost of ammo and guns was a guiding factor for the decision to jump back to 9mm, but I have to say some good 9mm defensive rounds came out of the whole process.