Having checked a few sites where wizards discuss these things one may find that:
NGP M71 (Neues Gewehr Pulver) is an improved version of black powder developed for the Mauser rifle 1871.
So ...
The model of these (HH) revolvers doesn't have to be as old as from 1871, but instead the type of gunpowder to produce the effect needed; big bangs with blank ammo. Also in this case, i guess, 2 grams of this powder would be a plausible dosis, considering the fairly large cartridges used.
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