Buy Remington Core-Lokt Ammunition 300 Winchester Magnum 180 Grain Core-Lokt Pointed Soft Point Box of 20. The classic “Green-box” ammunition that shooters and hunters have trusted for years. Remington makes ammunition for nearly every need. The Core-Lokt bullet design is the original controlled-expansion bullet and one of the most effective ever developed. Its progressively tapered copper jacket is locked to a solid lead core, promoting perfectly controlled expansion, deep penetration and high weight retention for dependable results. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.