The Hornady FlexLock Critical Duty .357 Mag 135-Grain Handgun Ammunition - 25 Rounds features a FlexLock® design with a Flex Tip®. Cannelured construction with crimped cases minimizes setback during feeding. High-antimony lead cores. Hornady FlexLock Critical Duty .357 Mag 135-Grain Handgun Ammunition - 25 Rounds - Pistol Shells at Academy Sports