I believe it is pretty much a historical thing back when ammo was made using things that didn't like being vibrated together. Nowadays it's not so much of a thing obviously, as we get a lot more factory ammo in boxes with the ammo touching.
There is an outfit called IATA (I think it's international air transport assn) that sets the DG carry rules, they set the amount you can carry on what type of aircraft and it's completely separate to the airlines and civil aviation outfits and even local Govts. This is the same group that is currently fretting over powerbanks and lithium ion batteries as an example - there are a lot of arguments going on at the moment between IATA and the member companies about the carry rules for powerbanks after a few incidents lately that have destroyed aircraft.
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