357 SIG vs 9mm: Niche Power vs Everyday Practicality 357 SIG vs 9mm is a useful comparison for handgun owners who want to understand speed, recoil, cost, availability, and real-world practicality. The .357 SIG is a high-velocity niche cartridge. The 9mm Luger is the global standard for handgun training, defensive ammunition, competition, and general ownership. […]