Winchester .223 Ammo Features Winchester USA .223 Remington 150 round value pack is a great choice for training or target shooting. This reliable brass cased ammo features reliable Winchester priming and powders and a full metal jacket bullet for positive feeding great accuracy and reduced fouling. Winchester .223 Ammo Specifications Brand: Winchester Ammo Model: USA Category: Centerfire Rifle Rounds Caliber: 223 Remington / 5.56 NATO Series: FMJ Value Pack Bullet Weight: 55 GR Rounds Per Box: 150 Casing: Material Brass Application: Target / Competition Bullet Type: Full Metal Jacket Muzzle Energy: 1282 ft lbs Muzzle Velocity: 3240 fps