With its increased speed, superformance produces flatter trajectories and less wind drift for improved accuracy as well as better energy transfer for maximum terminal performance.Highly efficient propellants accelerate the bullet longer, resulting in up to 200 fps increase in muzzle velocity, without additional peak pressure, boosting velocity without extra recoil.The ultimate all-around performer, superformance is safe in all types of firearms including semi-autos, lever guns, and pump actions.Caliber: 257 Roberts +PBullet Type: Super Shock Tip (SST)Bullet Weight: 117 grMuzzle Energy: 2253 ft lbsMuzzle Velocity: 2945 fpsRounds Per Box: 20Boxes Per Case: 10Application: HuntingCasing Material: BrassHazair: YesAmmunition cannot be shipped to a P.O. Box, please use a physical address during checkout. For restricted state buyers (CT, IL, NJ), please email a copy of your state's credentials, and a photo ID along your order number to ffl@firearmsdepot.com within 5 business days to avoid cancellation and refunding your order. For California, Massachusetts and New York buyers, please have your dealer email us a copy of their FFL or Ammo Vendor License along with your order number to ffl@firearmsdepot.com within 5 business days to avoid cancellation and refunding your order. Your order will not ship without us receiving this information. Thank you for your cooperation