Hornady® Superformance™ 7mm Remington Magnum 154gr SST® ammo is designed to deliver superior accuracy, rapid expansion, and optimal weight retention for superior knock-down power at extreme ranges. The polymer-tipped Hornady® SST boattail bullet design offers consistent expansion and superior weight retention by minimizing core-jacket separation, while premium, reloadable brass casings deliver smooth operation and reliable feeding performance at a low, affordable price. For optimal results with a gas-operated semi-auto firearm, it is recommended that all Hornady Superformance ammunition be paired with rifle-length gas systems and barrel lengths of 20" or longer. Any barrel and gas configuration of less than 20" is best served with the installation of an adjustable gas system, especially if firing suppressed. Made in USA.