Federal Premium Vital Shok 300 Winchester Magnum 180gr Nosler Partition Rifle Ammo - 20 Rounds - The Nosler Partition was the first bullet loaded in the Federal Premium line, and it continues to be a standard for consistency and reliability. Its partitioned lead core allows the front half of the bullet to mushroom on impact, but keeps the back half intact for deep penetration. Specifications: – Cartridge 300 Winchester Magnum – Bullet Type Nosler Partition – Grains 180 – Cartridge Case Nickel Plated – Muzzle Velocity 2960 FPS – Muzzle Energy 3502 FT LBS