Sierra BlitzKing Bullets 243 Caliber, 6mm (243 Diameter) 55 Grain Flat Base (100pk)Sierra BlitzKing bullets were specifically designed to combine the well known accuracy of the MatchKing with devastating and explosive expansion on varmints. The thin copper jackets enhance accuracy and allow for extreme expansion which is initiated by the green, polymer tip. These bullets were designed to be fired at velocities up to 4000 fps. Trust Sierra BlitzKings in your favorite varmint caliber to deliver the accuracy and terminal performance