Originally Posted by unit1069
Ask the Secret Service. That premier American protection agency certainly had (and has) access to many other handgun calibers to choose from when they decided on what was the best all-round choice for the task assigned to their agents.
How many shootings has the Treasury Dept (including the USSS) been involved in recently? Just because an agency adopts the .357Sig that doesn't mean that it's the most effective caliber/load available.
The USBP issued the .357Mag 110JHP (with the 125JHP as an option) to replace the erratic performing 38Spl 110JHP+P+ "Treasury" load, then the 115JHP+P+ in 9mm and then the 155JHP in 40S&W, and all of these loads were highly effective on BGs. And BTW, the USBP is involved in more shootings than all the other federal agencies combined.
The Sig cartridge is a limited "nitch" cartridge that can be replaced by all the other semi-auto service calibers. It's really a "neither fish nor fowl" cartridge and it's major downfall for LE use is cost of both training and service ammunition. The 40S&W caliber is much better suited for both LE and civilian SD use because of the various bullet weights/designs available in both training and SD ammunition.