Hornady Superformance Ammunition: 257 Roberts +P, 117 gr, SST, 2945 fps, Model 81353

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, GMX, and InterLock, bullets to levels of performance that are simply unattainable with conventional ammunition.

Proven Hornady Bullets
Superformance ammunition is loaded with Hornady V-MAX, NTX, SST, GMX, and InterLock, bullets for the ultimate in performance, no matter what the game.

Progressive Hornady Powders
Superformance Propellants are the heart of Superformance ammunition and usher in a new era of performance.

Case and Primer
Like all Hornady ammunition, our Superformance rounds use the highest quality cases and primers available. Consistent components translate to consistent shooting in the field.

Performance
IT IS FAST: 100 to 200 fps faster than conventional ammunition.
IT IS ACCURATE: Uncompromising accuracy without increased felt recoil.
IT IS CONSISTENT: Unfailing performance across a broad range of temperatures.
IT IS VERSATILE: This new breed of ammunition is available in 17 Hornet to 444 Marlin, and is safe for use in all firearm types, including semi-autos, lever guns and pump actions.

Superformance in Gas Operated Firearms
Superformance ammunition is safely within SAAMI pressure guidelines. Gas operated firearms are perfectly safe to use with Superformance ammunition. However, we have conducted tests and conclude that some systems work far better than others.