The Winchester W9NATO50 is the 50-round version of Winchester's high-pressure, military-spec 9mm load. Engineered to meet the rigorous demands of the North Atlantic Treaty Organization (NATO) specifications, this ammunition delivers significantly higher velocities and energy levels than standard civilian 9mm Luger practice rounds. It is the gold standard for shooters who want to train with the exact same ballistic profile used by military and law enforcement personnel worldwide. Usage Note: Because 9mm NATO is a higher-pressure load than standard 9mm Luger, please ensure your firearm is rated for +P or NATO-specification ammunition.