300 Ackley Match A.M.U. "WCC 60"

This giant match round has “300 AMU Magnum” written on it. This ammo seems to have several names. Which one is the best/official?
scan0053

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Not that much info available out there, but this might help.

http://www.cartridgecollector.net/300-ackley-match-amu

Daan
www.cartridgecollector.net

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