Doubletap Ammunition Tactical 9mm Luger +P 115 Gr Barnes TAC-XP Lead Fr. It is also an excellent defensive load with excellent penetration and expansion. Specifications for Doubletap Ammunition 9MM115X Tactical 9mm Luger +P 115 Gr Barnes TAC-XP Lead Fr: Manufacturer: Doubletap Ammunition Caliber: 9mm Luger Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 115 grain Cartridge Case Material: Brass Muzzle Velocity: 1350 ft/s Application: Self-Defense Primer Style: Centerfire