The 50 GI is a proprietary Guncrafter Industries cartridge. The concept was to create a practical .50 caliber 1911 without unnecessary bulk or weight, but with increased knock-down power. Factory loads for the 50 GI typically drives a 300 grain bullet at 700 -725 fps, which translates into a 210 power factor. This is achieved without loss of controllability. Firing this load feels comparable to shooting a standard. 230 hard ball factory round. However, the 50 GI is a very versatile cartridge and can be loaded to higher or lower levels, as desired. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.

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