yeah i had the same problem...i found a couple of articles....one was stating, that the B-Patrone was designed for the Luftwaffe....
you are right that it was indeed forbidden to use this kind of ammo for quite a while, until the germans noticed that russian marksmen were using some similar explosive ammo...only then it was used in infantry as well.
some of the articles say as well, that it was a superiour type to the Pmk, but expensive to produce, so that it was used rarely...however, ill have to talk to pitti again, as he has found a site, with historical loadouts for the 109
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