The Patriot Defense Ammunition .40 Smith & Wesson ammunition line is new factory-loaded with a 165 Grain Full Metal Jacket 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! Designed for range training and tactical exercises, the .40S&W is a rimless pistol cartridge developed jointly by major firearms manufacturers Smith & Wesson and Winchester. The .40S&W was developed as a law enforcement cartridge designed to replicate the performance of the FBI’s 10mm Auto. 50-round trayed retail packaging.