USA White Box .223 Rem Ammo Features Winchester USA White Box stands for consistent performance and outstanding value offering high-quality ammunition to suit a wide range of hunter s and shooter s needs. USA White Box .223 Rem Ammo Specifications Brand: Winchester Ammo Category: Centerfire Rifle Rounds Caliber: 223 Rem Model: USA Bullet Weight: 55 gr Rounds Per Box: 200 Casing Material: Brass Application: Recreational Shooting Bullet Type: Full Metal Jacket (FMJ) Muzzle Energy: 1282 ft lbs Muzzle Velocity: 3240 fps