According to Roy Jinks the 44 caliber has been standardized by S&W as their premier target and hunting cartridge since the 44 Russian and has evolved through the 44 Special to the 44 Magnum each working with the ammunition manufacturers to develop the best projectiles for accuracy and impact. Nothing comparable has been done to the 45 Colt. The 45 ACP has had similar development for accuracy in National Match shooting but the 44 revolver cartridges which vary only in length have about the top development in big bore revo ammunition. The 38 Special is another highly developed target cartridge but not really a big bore.