Patrone P318

Some days ago I get some P318 Patrone, which was quite strange for me.

All cartridges was loaded with standard S.m.K.H. RS. L’Spur geschoss, but all of them have no black tip marking.

Another strange moment - is colour marking on the primer. All primers almost covered with red varnish and with black ring around.

Marking “P 39 WaA700 3a”.

Could somebody tell me why this cartridges have such strange marking?

No idea?