The Federal Premium loads start with the finest primers, which are subjected to more frequent inspections for dimensional tolerances and charge weight to ensure they deliver consistent ignition for every shot. Next are the propellants, which are specially formulated to meet Federal's stringent specifications. These clean-burning powders are of the highest grades in the industry. They're consistent and reliable. The all-copper construction of the Barnes Expander brings handgun hunting performance to new heights. The loads provide 100 percent weight retention, outstanding expansion, and superb accuracy.