- Oct 8, 2019
Even in 9mm you can easily have 9x21mm.
It has extra 2mm of useless case just to exploit the loophole of governments saying "you can't have 9x19mm". That's the sole reason it was developed in the first place.
Performance wise it's the exact same as 9x19mm but the only catch is that's it's costly and you'll need to import it.
Other than that you can have .357 SIG or 10mm with both being "better" than 9mm.