Doubletap Ammunition Tactical 10mm Auto 125 Gr Barnes TAC-XP Lead Free. It is also an excellent defensive load with excellent penetration and expansion. Specifications for Doubletap Ammunition 10MM125X Tactical 10mm Auto 125 Gr Barnes TAC-XP Lead Free: Manufacturer: Doubletap Ammunition Caliber: 10mm Auto Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 125 grain Cartridge Case Material: Brass Muzzle Velocity: 1600 ft/s Application: Self-Defense Primer Style: Centerfire