This is 223 Corbon 55gr FMJ Bulk Pack Ammo. This is new manufactured ammo by Corbon that is brass cased, boxer primed, and non corrosive. It has an all copper jacketed projectile that will not stick to a magnet. The velocity is 3000 fps and 1099 ft lbs. This ammo is loose in 140rd boxes, 840rds to a case.