German Military testing of 7.65mm Lugers

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In Kenyons â??Lugers at Randomâ??, he states with regard to the 1908 Commercial/Military Luger â?? â??Manufactured by DWM for Military test/acceptance by the German armed forcesâ??.

Does anyone have any additional information about these â??testsâ??? Might some of these Lugers have been re-barrelled in 7.65mm by the military as late as 1913-14?

I have been told that the German Army did initially carry out some trials with 7.65mm Lugers, but all of these were fitted with a grip safety. I assume this was much earlier with the 120mm barrel M1900 version.

Is it possible that military testing of 7.65mm Lugers was taking place right up until the beginning of World War 1?