Underwood Ammo ASP Features Underwood Ammo s ASP line uses the Nosler Assured Stopping Power bullet a projectile engineered with deep skives in the jacket mouth to create precise reliefs that promote rapid consistent expansion. This design enhances the bullet s expansion characteristics without sacrificing feeding reliability or accuracy both of which matter in a self-defense scenario. At 115 grains and a muzzle velocity of 1550 feet per second this .357 Sig load generates 614 ft lbs of muzzle energy delivering strong terminal performance suited to personal defense applications. The supersonic rating ensures consistent ballistic behavior shot to shot. Nickel-plated brass casings used in this load offer several advantages over traditional brass including improved feeding across a variety of handgun actions and enhanced resistance to corrosion over time. These casings also resist tarnishing during storage or when in contact with materials like leather moisture or other metals keeping ammunition in better condition in a holster or magazine over long periods. Each box contains 20 rounds giving shooters a practical supply for range practice or carry rotation. Underwood Ammo ASP .357 Sig JHP is a dependable choice for shooters who prioritize consistent expansion and reliable feeding in their defensive ammunition. Underwood Ammo ASP Specifications Manufacturer: Underwood Ammo Model: ASP Caliber: .357 Sig Rounds Per Box: 20 Casing Material: Nickel-Plated Brass Muzzle Energy: 614 ft lbs Muzzle Velocity: 1550 fps Bullet Weight: 115 gr Bullet Type: Jacketed Hollow Point Application: Personal Defense Rating: Supersonic Available At: GrabAGun