How the .40 S&W Came to be
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Old 08-24-2011, 04:02 PM   #1
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Default How the .40 S&W Came to be

The 1986 Miami Shootout: The Gunfight That Changed Law Enforcement Nationwide - Guns News and Guns Reviews at Guns.com

This single incident brought about many positive changes in the shooting world in general and in law enforcement in particular. It directly led to the development of bonded handgun ammunition as well as a change in firearms training away from moving to the next threat after a double tap to keep shooting until the threat has been stopped.

It also led to the development of the .40 S&W and indirectly to the .357 Sig. Many LE agencies began drifting away from the revolver towards semi-automatic pistols chambered in .40 S&W which opened the door for the .45 ACP and more recently in .357 Sig. While many agencies issue a standard caliber, many authorize their officers to purchase and carry their own pistols in other calibers.

Although the Columbine Shooting saw more LE agencies purchasing, training and issuing patrol rifles to their officers, this incident proved how effective the .223 with mushrooming ammunition was in a gunfight.
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Old 08-27-2011, 12:51 PM   #2
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I have heard that the 40 S&W was developed because of the 10MM. The FBI wanted a new cartridge, so they came up with the 10MM. It's a good round, but kinda hot, too hard to shoot or something. So, the 40 uses basically the same components, dumbs it down a bit, and tries to hit between the 9mm & 45ACP. Which it has seemed to do.......

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Old 08-27-2011, 05:32 PM   #3
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I heard it was developed for da Ganstas, so they can shoot a forty while drinking a forty

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Old 08-28-2011, 12:23 AM   #4
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The .40 S&W is a "dumb" downed 10mm. I have one of the original test bed handguns for 10mm. An AO(Thompson) 1911 gov't. When the 10mm was tested, it was to heavy, to much recoil, and way too much over penetration. They must have had girlie men doing the testing. Uses 1911 mags, but holds 8.

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Old 08-28-2011, 01:47 AM   #5
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Yup 10MM was first, initially thought that the recoil was too stout so custom loads were made for LE to send a 180gr. bullet at 980ft/sc. 40S&W was developed to give 10mm power in a 9mm framed gun with high capacity capability and ease of carry.

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Old 08-28-2011, 02:00 AM   #6
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Yup 10MM was first, initially thought that the recoil was too stout so custom loads were made for LE to send a 180gr. bullet at 980ft/sc. 40S&W was developed to give 10mm power in a 9mm framed gun with high capacity capability and ease of carry.
I run 180's at 1100fps.+. Not sure how the .40 compares. The original 10mm was well past the Speed of sound. 1200fps+. I load down just because I don't need hyper velosity.
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Old 08-28-2011, 02:05 AM   #7
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The FBI Nancy Boys couldn't handle the 10mm recoil so they asked for a 10mm Lite.

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Old 08-28-2011, 02:28 AM   #8
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Quote:
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I heard it was developed for da Ganstas, so they can shoot a forty while drinking a forty
HA!

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Old 08-28-2011, 09:11 AM   #9
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Quote:
Originally Posted by clr8ter View Post
I have heard that the 40 S&W was developed because of the 10MM. The FBI wanted a new cartridge, so they came up with the 10MM. It's a good round, but kinda hot, too hard to shoot or something. So, the 40 uses basically the same components, dumbs it down a bit, and tries to hit between the 9mm & 45ACP. Which it has seemed to do.......
I believe the 10mm (from Norma) and the Bren Ten came out before the FBI "tests". As said by other responders, the 10mm, as it was initially offered, was a little too much for some shooters. The idea behind the .40S&W was to have the lowered powered 10mm shortened so a firearm originally chambered for the 9mm could be rechambered to the .40 bullet. Saving retooling costs for developing new handguns. S&W was big on 9mm handgun production at the time and created the .40. Thus the name .40 S&W.
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Old 08-28-2011, 02:29 PM   #10
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Jpatterson, that's a cool gun, how did you come about owning it?

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