In reply to:

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Please tell me why none of the existing dozen or more .400 to .450 cartridges propelling 400 to 500 grain bullets at 2100 to 2400 fps for around 5000 ftlbs muzzle-energy can't do the job!

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Ummm, because they weren't created by an Australian???

(Sorry, I saw one too many Fosters beer commercials here in the states)

Nitro, could you post a link - so I can see the rifle and this glorious new cartridge.