The Hornady Critical Duty Handgun Ammo 10mm 175 gr. FlexLock delivers a duty-grade solution for serious shooters who demand reliable barrier performance and consistent terminal results; the Critical Duty series pairs a cannelured bullet with a crimped case to prevent setback during feeding, while the InterLock band keeps bullet and core together for maximum weight retention through the FBI test barriers, giving law enforcement, home defense, and defensive handgun shooters confidence when facing intermediate barriers. This 10mm Auto load pushes a 175-grain FlexLock bullet at roughly 1,160 fps for about 523 ftlbs of energy, offering controlled expansion from a high-antimony lead core that is engineered to be exceptionally tough and maintain consistent penetration and weight retention compared to ordinary designs. The nickel-plated brass cases resist corrosion and make low-light chamber checks easier, and the overall package provides reliable feeding, dependable ignition, and repeatable performance in semi-autos and full-size 10mm pistols used for duty carry, range training, and defensive scenarios. Search-friendly keywords like Hornady Critical Duty, 10mm Auto ammo, FlexLock 175 gr, duty ammo, and handgun defense rounds appear throughout to help you find the load that balances barrier-stopping power with consistent terminal performance.