Originally Posted by ellenbr
>>Laborován speciální střelou s hlinikovou kuklou 5.0 g, Vo 1130 m/s, Eo 3200 J. <<

I have it on good authority from a mechanic that this text means:

Loaded with a Spezial Bullet w/ an Aluminum Jacket - 5,0 grammes, Velocity 1130 m/s, Energy 3200 Joules.

Nope.
Mistranslated. It means "aluminium hood", and with regard to the jacketed lead core bullet, this either refers to a (maybe hollow?) cap, or a (massive) starter tip.

The values given are advertisement fantasies from the late 1930 and 1940s. Maybe shot from 80 cms test barrels... Unanimously dismissed by German hunters.

Carcano