Compare Winchester Winchester Ammo WW556C 5.56 NATO 55 gr Full Metal Jacket (FMJ) 300 Bx/ MSRP: Was: Now: $174.99 AttributesCaliber: 5.56 NATOBullet Type: Full Metal Jacket (FMJ)Bullet Weight: 55 grRounds Per Box: 300Boxes Per Case: 1Application: Tactical,TrainingCasing Material: BrassManufacturer Part Number: WW556CL