I will be interested to hear that answer too, as it is another little tidbit that I find to be of questionable merit...I am not sure such an increase in power was necessary (but there is also a distinct possibility that DWM did develop a +P 9mm cartridge, 480D, just as they developed a +P 7.65mm in the form of the 471A cartridge).
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If it's made after 1918...it's a reproduction
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