Underwood Ammo ASP Features The Underwood Ammo ASP load in 9mm Luger +P uses the Nosler Assured Stopping Power bullet a design built around deep skives in the jacket mouth that create precise reliefs for rapid consistent expansion. This reliable expansion assures proper energy transfer and stopping power while limiting the likelihood of over-penetration a balance that matters for defensive ammunition. At 147 grains and 1125 feet per second the round produces 413 foot pounds of muzzle energy giving it real stopping power in a subsonic-adjacent controllable package. A sectional density of roughly 0.17 helps the bullet drive deep even after it has expanded. Nickel-plated brass casings deliver the same benefits found across Underwood s defensive lineup including improved feeding reliability across different firearm actions and stronger resistance to corrosion during long-term carry. The casings also resist tarnishing when exposed to leather moisture and other metals common in a daily carry holster. This combination of proven Nosler bullet design and Underwood s own loading standards makes the ASP line a dependable choice for concealed carry. Packaged 20 rounds to a box this Underwood Ammo load is available for sale at GrabAGun for shooters who want reliable expansion from their 9mm defensive round. Underwood Ammo ASP Specifications Manufacturer: Underwood Ammo Model: ASP Caliber: 9mm Rating: +P Bullet Weight: 147 gr Bullet Type: Jacketed Hollow Point Muzzle Velocity: 1125 fps Muzzle Energy: 413 ft lbs Rounds Per Box: 20 Available At: GrabAGun