This Winchester 45-70 Government Super X ammunition features a 300 grain Jacketed Hollow Point bullet, which provides quick, consistent expansion for maximum knock-down performance. The JHP bullet's alloyed lead core increases the retained weight for deeper penetration. Since 1922, Super X ammunition has provided exceptional quality and outstanding performance for all types of hunters and shooters who rely on its time-proven dependability backed by legendary excellence. Proven Accuracy High Velocity Maximum Impact Rapid Controlled Expansion Product Specifications Caliber: 45-70 Government Product Line: Super X Bullet Weight: 300 gr Bullet Type: Jacketed Hollow Point Muzzle Velocity: 1880 fps Muzzle Energy: 2355 ft/lb Quantity: 20/Box