Description PRODUCT DETAILBrand: Federal Category: Centerfire Rifle Rounds Caliber: 223 Rem Model: Premium Bullet Weight: 55gr Rounds Per Box: 20 Casing Material: Brass Application: Big Game Bullet Type: Barnes Triple-Shock X Muzzle Energy: 1250 ft lbs Muzzle Velocity: 3200 fps Firearms, trailers, and some accessories are only available for purchase in stores. Each location follows all BATF and individual state/county/city laws to insure the desired product is legal for sale. Any info provided online is subject to change, please go to your local store for more accurate information.