As EOD indicated, DM numbers 1000 and above are used for, let me say, non-end user items. An example is the primer for this cartridge, which has model number DM1465. Troops are, of course, not issued primers.
As far as I now, Bundeswehr uses three models:
DM11 - steel bullet in a copper cap/shoe (as you have sectioned)
DM21 - ordinary lead-cored full metal jacket boattailed for training
DM31 - hardened monobloc steel bullet (four large rounded grooves, 2 inside the neck area of the case, 2 at shoulder level)
What is the headstamp of your cartridge in question?