The Winchester USA Rifle Ammo 5.56mm 55 gr. FMJ 200 rd. from the Winchester USA series delivers dependable Lake City manufactured ammunition for range work and training, offering a 55 grain full metal jacket projectile loaded to 5.56x45mm NATO pressures with a listed muzzle velocity of 3180 fps and muzzle energy of 1306 ft lbs for consistent ballistics and trajectory awareness at common engagement distances. With brass casing and FMJ construction, this round feeds and cycles smoothly in AR-platform rifles and bolt guns used for target shooting, marksmanship practice, and high-volume drills where consistent ignition and extraction matter; the brass cases also simplify reloading logistics for handloaders. The 200-round pack size makes it convenient for extended sessions without frequent repacking, and the ORM-D flammability designation plus United States origin provide logistical clarity for storage and transport. If you're looking for a reliable, range-oriented 5.56 NATO option that balances velocity, energy, and consistent feeding in modern semi-automatic platforms, this Winchester USA 55 gr FMJ load is a strong choice.