In 1944-1945 Metallwarenfabrik Treuenbrietzen, Selterhof (hlb) made ammunition especially for use in the WB 81 weapons pods which contained six (three MG 81Z dual) guns. The firing rate of these guns was 1700-1800 RPM per barrel or 10,200-10,800 RPM for the Pod. The Junker JU-88 and Dornier Do-217 had the capability to carry six WB 81 weapons pods so for a short period could fire at a 61,200-64,800 RPM rate!! It’s no wonder they were nicknamed “watering cans”.
Feeding problems were encountered because of bullets becoming loose in the cases and jamming the disintegrating cartridge belts in the chutes. This was solved by adding an additional bullet crimp to the necks of the cases.
fer (Metallwerke Wandhofen GmbH, Schwerte/Ruhr, Rosenweg, bei Dortmund) cases dated 1943-1944 can also be found with a additional crimp on the case necks but these shouldn’t have been for use in the Luftwaffe WB 81 weapons pods, since the Air Force would only accept Zdh. 88 (and for a short time Zdh. 43) primers. All the fer cases with the extra crimp I’ve seen have Zdh. 30/40 primers.
Now for the purpose of my post. The only labels for these rounds I have seen are for SmE 15 round boxes and they have no indication that they are anything other than normal rounds. Does anyone have a 300 round sleeve or 900/1500 round case label or an auxiliary label that indicates WB 81 use only?
Also does anyone have a box label for the SmK and SmK L’spur loadings with the extra neck crimp?