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, producing rapid expansion and energy release, while keeping the back half intact for deep penetration through weight retention. It is perfect for all big game at close to mid-ranges. This Vital-Shok ammunition is made with Gold Medal primers, specially formulated propellant, and nickel-plated brass.