Here you can find an article and picture of the cartridge...
http://www.johannsen-jagd.de/data_de/presse/jagen/magnummanie.pdf

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I believe the cartridge cries for the 320 grain bullet, the 300 grain bullet can be driven to 825 m/s (ca 2700 f/s) and generates 6600 J(ca 4900 ft.-lb.)

CZ