This is .454 Casull Federal Premium Vital-Shok 300gr. Swift A-Frame Ammo. This ammo has been developed for handgun hunting which is one of the most challenging ways to take game. You choose to use your wheelgun because you like to get up close and personal with your trophy. The Swift A-Frame gets high weight-retention and controlled expansion regardless of distance. Deep penetration makes this bonded lead hollow-point bullet an excellent choice for handgun big game hunters. This ammo comes packed in 20rds. per box.