Dr Kaultmann was a designer for Rheinmetall when I met him first in the mid-1970s. His English was almost as bad as my German, but I understood that he began working for Rheinmetall before WWII or early in the war. He was involved in a wide range of things and in the late 1970s he developed a series of cartridges for a unique assault rifle, as I remember. The case was 9x19mm with a plastic extension and a plastic bullet/sabot with a steel core. There were probably over 20 variations of this round, I only got one because they were expensive and not really a 9mmP load. Others will have much more information on this cartridge and the experiment. There was a similar cartridge but with a black plastic bullet at the last SLICS auction. The cartridge pictured has a Geco commercial headstamp.
During the same timeframe, Dr Kaultmann was developing a similar bullet but the load was intended for weapons chambered for 9x19mm ammunition. I have two loaded cartridges and two seperate bullets. Both cartridges have normal W-W headstamps like the one pictured by R308. I think the seperate bullet on the left is the same as the one in the loaded cartridges on the right, or at least very similar. I’m sure there are more to this series.
I was wrong in my earlier note-I do not have one of these loads with a red plastic bullet. Dr Kaultmann also had a series of experimentals with plastic bullets filled with a metal powder/granduals which were intended to be non-lethal by expanding to about 1 inch disks shortly after leaving the barrel of the gun. I have one of that series with a red plastic bullet instead of the more normal blue.
Any more information on Dr Kaultmann’s experimentals would be appreciated.