Freedom Munitions .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammo 500 Rounds. Extensive R&D went into these casings with excellent performance results. Loaded with a 55 grain full metal jacket bullet this ammunition shoots at 3200 fps. This ammunition is not intended for use with suppressors. Specifications for Freedom Munitions .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammunition: Manufacturer: Freedom Munitions Caliber: .223 Remington Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 grain Cartridge Case Material: Brass Application: General Package Contents: Freedom Munitions .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammunition What is Freedom Munitions .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammunition good for? The manufacturer says that it is best for general.Freedom Munitions FM223F55N500: .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammo 500 Rounds