Doubletap Ammunition Tactical 7.62x39mm 123 Gr Barnes TSX Lead Free 20. 62x39mm 123 gr Barnes TSX Lead Free 20 - The DT Tactical has low muzzle flash as well as less recoil than the other loads available. It is also an excellent defensive load with excellent penetration and expansion. Specifications for Doubletap Ammunition 739123X Tactical 7.62x39mm 123 Gr Barnes TSX Lead Free 20: Manufacturer: Doubletap Ammunition Caliber: 7.62x39mm Number of Rounds: 20 Bullet Type: Flat Nose (FN) Bullet Weight: 123 grain Cartridge Case Material: Brass Muzzle Velocity: 2400 ft/s Application: Self-Defense Primer Style: Centerfire What is Doubletap Ammunition 739123X Tactical 7.62x39mm 123 Gr Barnes TSX Lead Free 20 good for? The manufacturer says that it is best for self-defense.