Hornady CX Superformance 308 Winchester 165gr Rifle Ammo - 20 Rounds - Superformance uses progressive propellants that take your favorite CX bullets to levels of performance that are simply unattainable with conventional ammunition. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. Fast, Accurate, Consistent, Versatile Progressive Powders Proven Hornady Bullets