Hornady 223 Rem 55 GR CX Superformance 20 Rnds (832744)  

Increase your rifle's 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 V-MAX,® NTX,® SST,® CX,™ and InterLock,® bullets to levels of performance that are simply unattainable with conventional ammunition.