Standard 9mm loaded past even the +P line into a place SAAMI declines to officially recognize. It exists mostly as law enforcement fodder built for people who wanted every last bit of push and did not much care about the fine print. Only a modern pistol built like a bank vault should ever see a steady diet of it. Your gun and your armorer settle this one not the box.
The market runs a handful of quality defensive loadings and nothing more. Priced above +P because you are paying for the ragged edge. Sold in small boxes when sold at all so the shooter who runs it stocks up whenever it appears.
