This Fiocchi Extrema hunting ammunition uses the best bullets in the business from SST, V Max, Interlock, Sierra Gameking, and Barnes Tipped Triple Shock. Its precision brass case is combined with the best powders and reliable primers to make the most of these world-renown bullets. The Extrema Rifle Hunting Loads are tested and qualified daily to ensure you receive the best they can deliver in extreme heat or cold hunting conditions.Specifications: Caliber: .223 RemModel: ExtremaBullet Weight: 40 grRounds Per Box: 50Casing Material: BrassApplication: Personal / Home DefenseBullet Type: V-Max Polymer TipMuzzle Energy: 1183 ft lbsMuzzle Velocity: 3650 fps