SIG HT all copper superior hunting rounds yield consistent 1.8x diameter expansion using premium-quality powders and primers for minimum velocity variation. Optimized nose geometry combined with premium nickel-plated shell casings delivering consistently reliable accuracy for taking down game. The 165gr 300 Winchester Magnum features a muzzle velocity of 3,110 fps and muzzle energy of 3,543 ft-lbs. This SIG HT cartridge is excellent for large game including elk, mule deer, and bear. California lead-free in compliance with California Fish and Game Code Section 3004.5 Consistent 1.8x diameter expansion. minimal velocity variation. Mfg: Sig Sauer, Inc.