The .40 S&W history begins in 1990 when Smith & Wesson and Winchester jointly introduced the cartridge to the commercial and law enforcement markets. Conceived as an optimal compromise between the stopping power of larger calibers and the manageable size of a 9mm pistol, the round was developed directly out of lessons learned from the tragic 1986 FBI Miami shootout. By shortening the powerful 10mm Auto case, engineers created a cartridge that could fit into medium-frame semi-automatic handguns while delivering superior ballistics to standard service rounds. For over three decades, it has remained a defining standard for law enforcement agencies and civilian self-defense practitioners worldwide.
40 S&W History
| Year / Date | Event | Developer / Company | Location | Notes | Source |
| April 1986 | The FBI Miami Shootout | FBI Special Agents | Miami, FL | Tactical failure of 9mm service rounds sparks demand for better stopping power | Wikipedia |
| Late 1980s | 10mm Auto Experiments | FBI / Smith & Wesson | Quantico, VA / Springfield, MA | Development of the reduced-velocity 10mm “FBI Load” | American Rifleman |
| January 17, 1990 | Official Introduction | Smith & Wesson / Winchester | Springfield, MA / East Alton, IL | Debuted alongside the S&W Model 4006 pistol | Wikipedia |
| 1990 | Glock Commercial Victory | Glock Ges.m.b.H. | Austria / USA | Glock 22 and 23 hit dealer shelves ahead of S&W | Wikipedia |
| 1994 | Federal Assault Weapons Ban | US Federal Government | USA | 10-round magazine limit supercharges the cartridge’s civilian popularity | Wikipedia |
| 1997 | FBI Adoption | Federal Bureau of Investigation | Quantico, VA | FBI officially adopts Glock pistols chambered in .40 S&W | Wikipedia |
Understanding The Cartridge History
The Catalyst (1986 to 1989)
Following the violent 1986 FBI Miami shootout, the Federal Bureau of Investigation sought a handgun cartridge that could deliver superior terminal ballistics compared to the standard 9mm Parabellum. This led to the adoption of the full-power 10mm Auto cartridge. However, agents found the recoil of full-power 10mm loads punishing and the handguns excessively large. The FBI requested a reduced-velocity “FBI Load”. During this collaboration, Smith & Wesson engineers realized that downloading the 10mm left a massive amount of empty airspace inside the case; shortening the case entirely yielded a compact, high-performance round ideal for standard pistol frames.
The 1990 Debut and the Glock Race
On January 17, 1990, Smith & Wesson officially debuted the .40 S&W alongside its steel-framed Model 4006 service pistol.However, Austrian manufacturer Glock achieved a major commercial coup by beating S&W to retail shelves, releasing the polymer-framed Glock 22 and Glock 23 just days prior.Because Glock had recently engineered the large-frame 10mm Glock 20, adapting the design to fit a shorter 9mm-sized frame was remarkably fast.The new cartridge was an instant commercial and law enforcement triumph.
The 1994 Ban and Peak Era
The popularity of the .40 S&W skyrocketed following the passage of the 1994 Federal Assault Weapons Ban, which restricted civilian magazine capacities to a maximum of 10 rounds.Because buyers were capped on round counts regardless of caliber, many chose the larger, harder-hitting .40 S&W over the 9mm, cementing its dominance in American police departments and civilian CCW markets throughout the late 1990s and 2000s.
Major .40 S&W Milestones
- The 10mm Case-Shortening Breakthrough: Taking the high-pressure foundation of the 10mm Auto and trimming the case length to 0.850 inches for medium-frame compatibility.
- The 1990 Dual-Launch Phenomenon: The simultaneous entry of S&W and Glock into the market, driving immediate global adoption.
- The 1994 Legislative Boom: Capitalizing on the federal 10-round magazine limit to dominate the American civilian and law enforcement handgun market.
Notable .40 S&W Firearms
- Smith & Wesson Model 4006:The all-metal service pistol that launched the cartridge publicly in 1990.
- Glock 22 and Glock 23: Full-sized and compact polymer pistols that became the quintessential law enforcement sidearms of the 1990s and 2000s.
- SIG Sauer P229: Specifically engineered around the high pressures of the .40 S&W, becoming a favorite of federal agencies like the Department of Homeland Security and the Secret Service.
Ballistics And Performance History
The .40 S&W utilizes a .400-inch diameter bullet, most commonly weighing between 155 and 180 grains.
- Velocity and Energy:Standard factory loads push a 180-grain bullet at roughly 950 to 1,000 feet per second, delivering significantly more muzzle energy than standard 9mm loads.
- Operating Pressures:Rated for a maximum SAAMI pressure of 35,000 psi, matching the high-performance thresholds of modern defense cartridges.
- Terminal Dynamics:Engineered to provide deep penetration and reliable hollow-point expansion in ordnance gelatin, meeting strict law enforcement benchmark criteria.
Key Developers
- Smith & Wesson Engineering Team: Spearheaded the dimensional transition from the long 10mm case into a compact, manageable service cartridge.
- Winchester Ammunition Ballisticians: Collaborated on propellant chemistry, case wall thickness, and mass-production standardization.
.40 S&W History By Decade
- 1990s:The cartridge is invented, commercialized, and rapidly adopted by law enforcement agencies and civilian self-defense markets.
- 2000s: Reaches peak popularity, serving as the standard-issue sidearm cartridge for the FBI, state troopers, and local police departments nationwide.
- 2010s: Experiences a gradual decline in police service as advancements in 9mm bullet technology close the terminal ballistic gap while offering higher magazine capacities and lower recoil.
- 2020s: Transitions into a dedicated enthusiast, surplus, and civilian defensive market standard, valued for its hard-hitting performance and affordable trade-in firearm availability.
Recent History
In recent years, the .40 S&W has seen a reduction in large-scale law enforcement contracts, as many agencies transitioned back to modern 9mm platforms utilizing advanced hollow-point projectiles. However, it remains a beloved caliber for millions of civilian shooters. The secondary market is currently flooded with inexpensive, highly durable police-trade-in pistols (like the Glock 22), making the .40 S&W one of the most cost-effective ways to own a proven, heavy-hitting defensive sidearm.
Best Sources For .40 S&W History
- Wikipedia (.40 S&W page):Excellent for verifying exact case dimensions, SAAMI pressure limits, and release timelines.
- American Rifleman: Provides deep historical retrospectives on the post-Miami shootout testing and the creation of the cartridge.
- True Shot Academy / Industry Archives: Offers comprehensive breakdowns of law enforcement adoption cycles and modern use cases.
Common Questions
When was the .40 S&W invented?
The cartridge was officially introduced to the public on January 17, 1990.
What is the parent case of the .40 S&W?
It was derived by shortening the 10mm Auto cartridge case.
Why was the .40 S&W created?
It was created to replicate the performance of the FBI’s reduced-velocity 10mm load in a smaller package that could fit into standard, medium-frame 9mm-sized semi-automatic handguns.
Is the .40 S&W more powerful than the 9mm?
Yes. In terms of raw muzzle energy and bullet mass, the .40 S&W generally delivers heavier impact forces than standard 9mm ammunition, though it also produces sharper felt recoil.
Why did police departments move away from the .40 S&W?
As bullet design technology advanced, modern 9mm ammunition achieved terminal performance equal to older calibers while offering significantly lower recoil and higher magazine capacities, prompting many agencies to switch back.