Hornady Superformance 2.75" 12GA 300gr MonoFlex ammunition is a shotgun slug round featuring Hornady's tough copper alloy Monoflex projectile for deep penetration. Designed to retain 95% of its weight, the projectile boasts an open cavity filled with an elastomer material that compresses upon impact for lethal rapid expansion and maximum impact. This shotgun slug ammo features clean-burning powders and propellants paired with premium components and loaded in premium brass casings and plastic hulls for dependable ignition, super-flat trajectories, and smooth operation when it matters most. Made in USA.