The reason that static electricity is not very likely to ignite black or smokeless powder is two-fold. Static charges tend to accumulate mostly on the outside of vessels or containers, and any static discharge is more likely to go to ground, and away from the powder inside. Also, powder grains are coated with graphite which makes them a bit harder to ignite. Not all static electricity charges are equal in energy, and a static electricity charge of sufficient energy can be a source of ignition. I have also never heard of black powder exploding in a reloading powder measure, and I have used small plastic vials for many years to hold pre-measured loads for hunting.
However, Black powder, especially fine granulations and black powder dust, certainly can be, and has been, ignited by static charges, as can many other explosive dusts or vapors. That is why workers in plants where these gun powder products and fireworks are made are required to wear cotton clothes and grounding straps, and all of the hoppers and equipment are carefully grounded. The IEC, OSHA, and the NFPA introduced these regulations as a direct result of explosions.
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