This auction is for 400 rounds of FEDERAL 5.56 brass cased 55 grain FMJ brass case ammunition. This Federal #XM193 ammunition is brass cased Full Metal Jacket 55 grain ammunition, and the brass cases are reloadable. Each bullet is 55 grain, FMJ, Full Metal Jacket 5.56 ammunition. There are 400 rounds of Federal brass cased FMJ ammunition shown in the auction pictures, and this auction is for 400 rounds of new Federal 5.56 brass cased FMJ new ammunition, which is both reloadable and non-corrosive. Federal Product Code XM193. 400 rounds bulk packaged, in a military ammo can, for a total of 400 rounds of 5.56 FMJ ammunition, using New FMJ Bullets. If you have any questions or concerns, use the Ask Seller a Question function above. thanks for looking.