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Clever idea for packing, but, personally, I wouldn't use "unprimed" in any description. Why tempt fate ?

That works as well. But call the contents "brass extrusions / tubelets / cylinders etc ... and NOT empty cartridge cases. And package in such a way they don't rattle around inside the container....

With most airlines it is acceptable / legal to carry as checked in luggage. BUT, it pays to be certain that carriage as such is consistent with the particular airlines carriage policy. Most name...