PULVERDAMPF

Wiking-76 hat geschrieben:...meinst du aufgrund der Temperatur oder im Laufe der Zeit?

MfG,

All-weather propellant
The nitre, or saltpeter (potassium nitrate) is main element of black gunpowder. The black powder is presumably still the least sensitive propellant to variable ambient temperatures, especially the icy frost. During the World War II had Germans so-called "DiDi-Pulver" (with added di-nitro-di-ethylene-glycol) for use in artillery pieces and NP-Pulver (with added penta-erythrite-tetra-nitrate) for rifle-caliber machine gun ammo, loaded for air forces, yhe famous Luftwaffe.

Both of them were claimed to be as immune to frosty weather as black powder, but no handloader is able to buy "DiDi" or "NP" from local sporting goods store. Composition of them may still be "classified" ?! Usual double-base powders have nasty habit to "freeze" in a cold climate. They are "fine-weather powders", fit for use in dzhungle of East-India or savannah of Africa -- and, of course, for indoor gallery practice.

In the tundra or taiga of Siberia, or sub-arctic Finland (where all intellectual life seems to be hibernating since September until Mayday) are all-weather powders needed. They are single-base powders with cylindrical or tubular kernels, or square flakes. Powders for shotshells and handgun cartridges (or "general-purpose powders" according to the author) are usually "washed" to become porous-surfaced like an exposed-aggregate concrete.