Buffalo Bore Ammunition Standard Pressure 380 ACP 90 Gr Jacketed Hollow. Buffalo Bore produces strictly big bore ammo with massive firepower and dramatic results. Specifications for Buffalo Bore Ammunition 27G/20 Standard Pressure 380 ACP 90 Gr Jacketed Hollow: Manufacturer: Buffalo Bore Ammunition Caliber: .380 ACP Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 90 grain Cartridge Case Material: Brass Muzzle Velocity: 1025 ft/s Application: Self-Defense Primer Style: Centerfire