Smokeless propellants are the granular materials that are often called smokeless powder but which are not explosives and which burn but do not detonate . It is no small concern that granular materials added to granular propellants will also segregate from the main material during transport because they cannot have the same density as the propellant particles and will either rise to the surface or settle. Such segregation could have disastrous effects on performance and even lead to destruction of the firearm . Hence the real concern of the military over such measures. This is true of paint chips, ceramic multi-layers, plastic particles and wire fragments.
Black powder is also the result of decades of research at major corporations.
This research lead to a relatively safe, reproducible product used by re-enactors, hunters, and by international as well as national competition shooters. It is a granular materials and the addition of granular taggants to it gives rise to the same concerns as is the case for smokeless propellants. Recent calls for tagging. That suggests that all stored reserves of reloading components would become contraband. All hunters, competitive and other shooters who reload to produce better ammunition, ammunition not commercially available or to just save money would have to surrender all powder, all loaded ammunition and perhaps primers they now possess .