The .458 MCW Express was designed in 1953 by Harold E. MacFarland, Mervin Corbett Jr. and Fred F. Wells, all from Prescott, Arizona. It is based on the .375 H&H Magnum case and predates the introduction of the .458 Winchester Magnum and .458 Lott. Loaded with bullets weighing between 300 and 600 gr and introduced commercially by Quality Cartridge in the early 2000’s.