SAAMI, or the Sports Arms and Ammunition Manufacturers Institute was founded in 1926 at the request of the federal government to create and publish industry standards. They created the following standardized strength / pressure ratings used in most modern handgun munitions.
- Standard …………… 34,080 PSI
- +P ……………………… 36,000 PSI
- NATO .…………………36,500 PSI
- +P+ .……………………No SAAMI Pressure Specification – No common PSI or regulation