Federal Premium 270 Winchester 130gr 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. World-Renowned Bullet Features A Partitioned Lead Core Front Half Mushrooms, Producing Rapid Expansion And Energy Release Back Half Remains Intact, Ensuring Deep Penetration Through Weight Retention Perfect For All Big Game At Close To Mid-Ranges