Freedom Munitions .308 Winchester 147 Grain Full Metal Jacket Brass Rifle Ammo 20 Rounds. The FMJ bullet is a projectile consisting of a soft lead core encased in a copper shell. This allows for higher velocities and improved feeding characteristics. Specifications for Freedom Munitions .308 Winchester 147 Grain Full Metal Jacket Brass Rifle Ammunition: Manufacturer: Freedom Munitions Caliber: .308 Winchester Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 147 grain Cartridge Case Material: Brass Application: General Package Contents: Freedom Munitions .308 Winchester 147 Grain Full Metal Jacket Brass Rifle Ammunition What is Freedom Munitions .308 Winchester 147 Grain Full Metal Jacket Brass Rifle Ammunition good for? The manufacturer says that it is good for general.Freedom Munitions FM308F147N20: .308 Winchester 147 Grain Full Metal Jacket Brass Rifle Ammo 20 Rounds