The total range of a 9mm is within the 1200 - 1500 meters, for all I know this is a pretty well-researched fact. So with a total range of 1200 - 1500 meters, I fully expect 800 meters to be feasible and lethal. Of course it will be difficult to hit a target dead center but as said before, the point was to keep the enemy away from the minimum field artillery range and the artillery unit themselves.
The 800 meter 'french helmet' story can be found in the official LP08 manual issued by the German army:
Translation from the manual (1917):
Performance of the Lange Pistole 08.
Due to the high rate of fire and the ease with which it can be handled, the pistol, in combined firing, and with enough ammunition available can be used effectively even against head sized targets up to 600 meters. Between 600 and 800 meters, with the correctly set sights, results can still be expected.
Up to 200 meters, every target can be hit with result in single fire.
At 800 meters a horse skull and a french steel helmet will be shot through.
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