Freedom Munitions .300BLK 147 Grain Full Metal Jacket Brass Rifle Ammo 500 Rounds. This ammunition shoots at 1800 fps. The 300 Blackout cartridge (often referred to as 300 AAC 300 AAC Blackout 300 BLK or simply Blackout) has proven itself over the last decade to be an effective means for taking thin skinned game cartridge when used at ranges of 100 yards and in. Specifications for Freedom Munitions .300 Blackout 147 Grain Full Metal Jacket Brass Rifle Ammunition: Manufacturer: Freedom Munitions Caliber: .300 AAC Blackout Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 147 grain Cartridge Case Material: Brass Application: General Package Contents: Freedom Munitions .300 Blackout 147 Grain Full Metal Jacket Brass Rifle Ammunition What is Freedom Munitions .300 Blackout 147 Grain Full Metal Jacket Brass Rifle Ammunition good for? The manufacturer thinks that it is good for general.Freedom Munitions FM300F147N500: .300BLK 147 Grain Full Metal Jacket Brass Rifle Ammo 500 Rounds