.500 Wyoming Express
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The .500 Wyoming Express is a "big bore" handgun cartridge. Like most handgun cartridges of this size, it is used almost exclusively in revolvers. It is designed mainly for hunting rather than self defense or tactical usage. The cartridge is comparable in size to the .50 Action Express, but has higher powder loads and normally a lower velocity. Though not as powerful as the .500 S&W Magnum, the .500 Wyoming Express is one of the most powerful handgun cartridges commercially available today.
[edit] Reference
Taffin, John. "Freedom Arms' Biggest Big Bore", Guns magazine, FMG Publications, April 2006, pp. 46-51. Retrieved on July 7, 2006. (in English)