A little bump to this topic;
Yesterday I've heard 3 plausible reasons why this projectile is how it is;
1) PRACTICE: it is possible that this is a practice round, instead of explosives it could be filled with sand.
2&3) It could be a fire-at-night situation where you've got 2 possibilities;
-----A: the soldiers were drunk (all 5 of them???)
-----B: and that's a bit more acceptable; They did this on purpose
you know how they say to not wake a sleeping dog, well, those Germans must have thought the same.
They got their fire-mission but it was a quit night. So to not draw fire from the enemy, they fired the
rounds with the transport-plug. There for the shell landed without exploding.
The officer who gave the order could hear them firing so for him it was a done deal.
So, what do you guys think. Maybe one of you already heard of one of those reasons possible on either
side of the battlefield.
edit: the copper-belt is about 1,5cm wide right? So I thought this means the projectile is completely German.