The problem was also found here in France, during Armament and Defense exhibitions, like Eurosatory… As complete rounds are most of time illegal, this is not the case for sectionned items.
In several cases, I observed interesting solutions :
-On medium and biger caliber specs, the primer compound was replaced by a kind of plastic resin, somehow similar to the brands used in dental prosthesis labs, with a color added “ad-hoc”, as the usual “pink” shade used for dentures cannot, of course, be retained… In Dental products firms, this resin can be obtained (by professionals_you have to be one of them, or tohave a Dental Surgeon as a friend!) in uncolored condition. It is is quite easy to work(powder monomer+liquid monomer) and polish. Just be careful when mixing it, as the polymerisation reaction is thermoforic, up to # 60°C.
-This system was also retained for preparing projectile sections, where the explosives parts had been cautiously removed and replaced by diverse plastic compounds of various colors had been used…
-For the propellant, it had been of course removed, and replaced by…“couscous” or “Bulgur”, a kind of cereal, glued in place then sprayed in grey or bright black !!! I also noted on big artillery rounds, a similar effect obtained with cut spaghetti pasta, for their tubular shape !!!
Even if I don’t collect anymore live and complete ammunition to-day, only pictures, books and documentation, I still kept my sectionned rounds collection, which is interesting, beautiful to look at, and …completely inert, and so, legal…(Can tell you that my wife is quite happy now!).
So I still own a very neat specimen of 30 mm HS so-sectionned and prepared… quite a nice item indeed… I also have several sections as advertising items, received from Oerlikon Contraves… very cute! or some ones from the former Manurhin-Cusset.
These sectionned rounds are in most of the civilsed world, considered as non-ammunition…
Now the question is how to get the stupid and terrified bureaucrats understand that…I am afraid it can be only a dream, most of the time…! Nobody can ask them to behave like Einstein to work in a Postal Administration…