This is a high performance STANDARD PRESSURE 40 S&W loading, which means it is safe to fire in all 40 S&W firearms that are in normal operating condition. The light weight 140gr. all copper Barnes bullet will mushroom readily, yet penetrate as deeply as a typical 180gr. JHP style bullet, while generating the low recoil and fast velocities of a light weight projectile. This aids in fast/accurate follow-up shots. Expect roughly 13 to 14 inches of penetration in flesh and bone. This load utilizes a flash suppressed powder, which gives the shooter an important tactical advantage as most shootings in the US occur in low light when the criminal element is most active. Firing to save your life in the dark is likely if you find yourself forced to fire. Blinding yourself with your own gunfire, after the first shot, leaves you very vulnerable. Specifications: 40 S&W/140 gr/Barnes TAC-XP/Lead Free/20 Per Box/12 Cs