The Hornady Superformance 7mm Rem. Mag. 139 gr. SST is a high-velocity entry in Hornadys Superformance rifle ammunition series that delivers flat trajectories and deep-penetrating Super Shock Tip performance for serious hunters and long-range shooters, offering a muzzle velocity of 3240 fps and muzzle energy around 3239 ft-lbs to reach distant targets with controlled expansion and retained weight. With brass casings and American origin, this round feeds reliably in magnum bolt guns and modern hunting platforms, making it well suited for big-game applications where terminal performance and consistent ballistics matter; the Superformance line is tuned to extract extra speed from standard powders without raising chamber pressures, translating into extended effective range and less wind drift when you need every inch of performance. If youre dialing in elevation for alpine elk, stretching shots on plains game, or relying on one-shot stops in mixed terrain, the 139-grain SSTs design balances sectional density and shock to produce deep wound channels, predictable expansion, and good penetration on shoulder and vitals. Choose this Hornady Superformance offering when you want a proven magnum hunting load with consistent muzzle velocities and dependable feeding from quality brass cases.