Winchester USA Ready 9mm Luger Ammo 124 Grain P Jacketed Hollow Point ammo review offers the following information; Target growth with CCW enthusiasts & new home defense gun owners introduce new bullet with Hex-Vent technology. Founded in 1866 in New Haven, CT Winchester is as American as apple pie. One of the most commonly used manufacturers for a wide range of shooting needs, Winchester USA is an outstanding pick due to its reliability, consistency and durability. From the start Winchester was one of the top designers of rifle ammunition and were the first to introduce some of the top rifle calibers that are still used by marksmen today.