A high-volume day at the range with friends balanced with peace of mind subsonic silence. 400 rounds of 5.7x28mm in one convenient combo pack. Range Dynamics 5.7x28mm Full Metal Jacket 2 boxes of 150 rounds each. This 5.7 cartridge is a 40-grain, full metal jacket projectile bundled in a 150-round package. Range Dynamics 5.7x28mm Subsonic 2 boxes of 50 rounds each. Featuring a 62-gain FMJ bullet, this subsonic cartridge offers reduced recoil impulse and sound signature, making it the go-to for suppressed or unsuppressed shooting and general plinking. Mfg: Fiocchi Ammunition