Doubletap Ammunition Defense 9mm Luger 77 Gr Lead-Free Hollow Point 20. It runs at standard 9mm pressures with very little recoil. This load is an excellent choice for home defense or CCW where limited penetration is needed. Specifications for Doubletap Ammunition 9MM77X Defense 9mm Luger 77 Gr Lead-Free Hollow Point 20 B: Manufacturer: Doubletap Ammunition Caliber: 9mm Luger Number of Rounds: 20 Bullet Type: Lead-Free Hollow Point Bullet Weight: 77 grain Cartridge Case Material: Brass Muzzle Velocity: 1600 ft/s Application: Self-Defense Primer Style: Centerfire