Fiocchi Ammunition Range Dynamics, Subsonic, 300 Blackout, 220 Grain, Boat Tail Hollow Point Matchking, 25 Round Box 300BLKMB With a thick jacket, improved boat-tail, and long ogive, MatchKing bullets have long been the standard by which all others are measured. Loaded at the state-of-the-art Fiocchi facility in Ozark Missouri, Fiocchi Hyperformance Match ammunition provides precision you can count on at a factory-loaded price you can afford. MatchKing is a registered trademark of Sierra Bullets.