[Olefin]

Well the ammo and explosives factories should keep them supplied with more than one clip per man- you can carry a hell of a lot of bullets and grenades and mortar shells on relatively small ships. However that doesnt keep them supplied with such non-essentials (sarcasm intended) as boots, medicine, uniforms, tents, food, etc.

So they would have stuff to shoot - but they might be going around pretty badly clothed and fed after a while.

Sorry Leg and Stainless - but Australia makes a lot of nitric acid and has lead available in abundance. Thus they can make smokeless powder easily and also lead for bullets. The soldiers would need to collect brass for reloads but that should be relatively easy. So bullets wont be a problem.

However once the transport network starts to break down getting those bullets to the North so they can be shipped to Papua would be the real issue - but making the bullets themselves and getting powder for them wont be a real problem for quite a while.