The .500 A-Square is a belted, bottleneck rifle cartridge, developed by Arthur Alphin in 1976.
However, the .50 BMG is the world's most powerful commercial cartridge for any shooting purpose.
The .500 A-Square is used specifically as an African, thick skin, dangerous game, rifle cartridge for the hunting of elephants and Cape buffalo as well as a backup gun for professional hunters and guides.
The ammunition comes in three loads: 600 grains (38.9 g) Monolithic Solid; 600 grains (38.9 g) soft nose thick jacket and 600 gr (38.9 g) soft nose thin jacket.
In comparison: the parent cartridge, the .460 Weatherby Magnum as commercial loaded with a 500 gr (32.4 g) Monolithic Solid has a muzzle velocity of 2580 ft/s (786 m/s) and muzzle energy of 7389 ft lbf (10018 J).