PMC Ammunition X-Tac Match .223 Remington 77 Grain Open Tip Match Brass Cased Rifle Ammo 20 Rounds. This ammunition was created by combining the performance associated with X-TAC ammo with Sierra Bullets which are known for world-class ballistics. Specifications for PMC Ammunition X-Tac Match .223 Remington 77 Grain Open Tip Match (OTM) Brass Cased Rifle Ammunition: Manufacturer: PMC Ammunition Caliber: .223 Remington Number of Rounds: 20 Bullet Type: Open Tip Match (OTM) Bullet Weight: 77 grain Cartridge Case Material: Brass Muzzle Velocity: 2790 ft/s Muzzle Energy: 1296 ft-lbs Application: Target Primer Style: Centerfire Sectional Density: 0.219 G1 Ballistic Coefficient: 0.372 Package Contents: PMC Ammunition X-Tac Match .223 Remington 77 Grain Open Tip Match (OTM) Brass Cased Rifle Ammunition What is PMC Ammunition X-Tac Match .223 Remington 77 Grain Open Tip Match (OTM) Brass Cased Rifle Ammunition good for? The manufacturer says that it is best for target.PMC Ammunition 223XM: X-Tac Match .223 Remington 77 Grain Brass Cased Rifle Ammo 20 Rounds