The ADI World Class .223 Remington ammunition features 55-grain Sierra Blitzking boat-tail bullets in high-quality brass cases for superior accuracy and performance.ADI World Class Sierra Blitzking Boat-tail ammunition.223 Remington caliber55-grain bullet weightBrass cased for reliable performance20 rounds per boxBoat-tail design for enhanced ballisticsIdeal for precision shooting varmint hunting and target practice with consistent velocity and exceptional accuracy from ADI's world-class manufacturing standards.