"Duty Pistol Calibers
After a major shift initiated by the FBI just a few years ago, the 9mm reigns supreme as the standard duty caliber in issue handguns across the U.S., despite the fact that, almost 30 years ago, the same FBI pushed the development of the .40 Smith & Wesson cartridge as the ultimate law enforcement round. The .40 replaced the 10mm as the FBI’s ultimate cartridge and also sounded the death knell for the .38 Special revolver, which had been the standard since the 1900s.
The 9mm is a reasonable choice as a duty round. The 9mm is reasonably powerful and accurate and is more mild-mannered than the .40. But what about the specific duty pistols and the ammunition that stokes them? Well, that’s the complicated part.:
https://www.usconcealedcarry.com/blog/which-firearms-and-ammo-do-police-use/
