Bullet Style: SST Bullet Weight: 130 gr. Caliber-Gauge: .270 WIN. Made in the USA Quantity per Box: 20 Specific Caliber: .270 Win. HOR Superformance .270 Winchester 130 Grain SST Superformance Line Super premium ammunition line. Every cartridge contains premium propellants that are custom blended to deliver maximum velocity and optimum performance. Exceptional temperature sensitivity from -15 to 140 degrees Fahrenheit. Exceeds velocities of conventional ammunition without a significant increase in recoil.