Ammo Inc 223055FMJA20: The .223 Rem 55 GR Full Metal Jacket is the perfect ammo for hunting out in nature or at the range. You will not find a higher quality, better performing line of rifle ammo than the Signature Ammo, Inc. rifle line. Balancing velocity, accuracy, and recoil, our development team carefully analyses every load to help ballisticians achieve the specific outcome of superiority.