Hrndy Sf 5.56nato 55gr Cx 20/200Increase your rifles performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. Superformance uses progressive propellants that take your favorite bullets to levels of performance that are simply unattainable with conventional ammunition. Features : (Copper Alloy eXpanding) CX bullet provides uniform, controlled expansion, deep penetration and +95% weight retention