I just had a USPS priority box with bullets and brass sent to an address in NZ from a mate in the US. No problem, and amazing fast. It isn't cheap to send lead bullets priority mail, but if you need them, you gotta pay the price.
Most companies that sell components, (non-hazardous) don't want to bother with the extra time and cost to ship to NZ or Australia from my experience. If you find someone to ship to you, make sure they use the reinforced tape around the boxes. The priority boxes have gotten really thin and weak in the past few years. If bullets, have them use a bag inside the box for additional help if the box gets smashed or cut.
Cheers
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