Doubletap Ammunition Defense 45 ACP 230 Gr Jacketed Hollow Point JHP. This round virtually has no muzzle flash and is an excellent defensive load with excellent penetration. Specifications for Doubletap Ammunition 45A230CE Defense 45 ACP 230 Gr Jacketed Hollow Point (JHP): Manufacturer: Doubletap Ammunition Caliber: .45 ACP Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 230 grain Cartridge Case Material: Brass Muzzle Velocity: 1000 ft/s Application: Self-Defense Primer Style: Centerfire