Sierra Bullets GameChanger .300 AAC Blackout 125 grain Sierra Bullets Tipped GameKing Brass Centerfire Rifle Ammo 20. 300 AAC Blackout came along to beef up the M4 from 5.56mm NATO and 300 Blk ammo has been in high demand ever since. Still used in many MSR's (Modern Sporting Rifles) many hunters have also picked them up for bolt-action match and hunting rifles. 300 Blackout Ammo comes in many different configurations for a variety of uses but Sierra Bullets brings these to the table with one thing in mind: hunting. This 300 AAC Blackout ammo has a 125-grain Sierra Tipped GameKing (TGK) bullet a boat-tail with a polymer tip for rapid expansion. This makes them perfect for dropping deer and hogs at moderate ranges. With a muzzle velocity of 2115 fps (feet per second) and a G1 BC (Ballistic Coefficient) of 0.298 you can trust the lead core and thick copper jacket to penetrate and generate controlled expansion time and time again. Specifications for Sierra Bullets GameChanger .300 AAC Blackout 125 grain Sierra Bullets Tipped GameKing Brass Centerfire Rifle Ammunition: Manufacturer: Sierra Bullets Caliber: .300 AAC Blackout Number of Rounds: 20 Bullet Type: Spitzer Boat Tail (SBT) Bullet Weight: 125 grain Cartridge Case Material: Brass Muzzle Velocity: 2115 ft/s Application: Large Game Package Type: Box Primer Style: Centerfire Features of Sierra GameChanger .300 AAC Blackout 125 Grain Sierra Tipped GameKing Brass Cased Centerfire Rifle Ammunition: Muzzle velocity of 2115 fps (feet per second) G1 BC (Ballistic Coefficient) of 0.298 125-grain Sierra Tipped GameKing (TGK) boat-tail (BT) bullet Polymer tip lead core copper jacket Package Contents: Sierra Bullets GameChanger .300 AAC Blackout 125 Grain Sierra Bullets Tipped GameKing Brass Cased Centerfire Rifle Ammunition Box of 20 Rounds What is Sierra Bullets GameChanger .300 AAC Blackout 125 grain Sierra Bullets Tipped GameKing Brass Centerfire Rifle Ammunition good for? The manufacturer thinks that it is best for large game.Sierra Bullets A4625--10: GameChanger .300 AAC Blackout 125 grain Sierra Bullets Tipped GameKing Brass Cased Centerfire Rifle Ammo 20 Rounds