The 450 Bonecrusher was designed by Lee Marvin from Arlington, VA in April 2002. The development of the 454 Casull proved that it was possible to duplicate the performance of very large frame revolvers like the Magnum Research 450 Marlin with a smaller cartridge/gun combination although at higher pressures. The idea behind the Bonecrusher was a cartridge with increased case capacity/lower pressure that could operate through a standard Ruger Blackhawk frame. It is based on the 500 Linebaugh case short neck, 25-degree shoulder, and 0.005” total body taper. Though it is still a bottleneck case, the majority of the case is straight walled in appearance.