The Patriot Defense Ammunition .338 Lapua Magnum ammunition line is new factory-loaded with a 250gr Sierra Matchking Hollow Point Boat Tail Projectile & Brass Case. Patriot Defense Ammunition is a Veteran Owned-and-Operated brand, serving shooters and strengthening our nation with genuine American ingenuity, so you can be proud of every bullet you fire! The 338 Lapua Magnum is a rimless, bottlenecked, centerfire rifle cartridge, originally developed in the 1980s as a high-powered, long-range cartridge for military snipers. The design specifications of this cartridge make is suitable for several civilian applications, such as long range target practice & competitive shooting, as well as bringing down large game like moose, brown bear, and ellk. 20-round sealed retail box.