Doubletap Ammunition Defense 45 ACP 185 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 45A185CE Defense 45 ACP 185 Gr Jacketed Hollow Point (JHP): Manufacturer: Doubletap Ammunition Caliber: .45 ACP Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 185 grain Cartridge Case Material: Brass Muzzle Velocity: 1200 ft/s Application: Self-Defense Primer Style: Centerfire What is Doubletap Ammunition 45A185CE Defense 45 ACP 185 Gr Jacketed Hollow Point (JHP) good for? The manufacturer suggests that it is good for self-defense.