This cartridge has an extra crimp on the neck to hold the bullet better. I can read from the information i have that it was only made by the -hlb- factory. It was ment to solve a loadingproblem in the Mg81.
The factory list i have, says that the hlb plant only made Sme and Smk with doppelcrimp in lot6 that year. As seen on the picture, the ring is Green ans states Ss bullet.... Does anybody have an idea why this is so?
And Dutch11, maybe you have a boxlabel from your fine collection ,for the doppelcrimped cartridges to show us?
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Regards
Bunker