Hornady Superformance 5.56x45mmNATO 55gr Copper Alloy eXpanding 20 Per Box/10 Case 812544

Superformance ammunition achieves 100 -200 fps over SAAMI standard in all calibers, all bullet weights and all bullet types. This performance is achieved by revolutionary new, extremely efficient powders optimized for each load. Superformance ammunition is safely within SAAMI pressure guidelines. 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 bullets to levels of performance that are simply unattainable with conventional ammunition. 100 -200 fps over SAAMI standard;Accuracy without increased felt recoil;Performance across a broad range of temperatures.