Here are some resources I have found useful:  This is a great site for small caliber reloading information (14, 17, 20 calibers). It has a great forum with users participating from all over the world.  This is a good NZ site with 'Hunting' and 'Guns' forums that are quite active with New Zealanders participating.

Custom Cartridges  Mark Bridgeman is based in Taupo and can supply most reloading products and has a wealth of knowledge on reloading and hunting in NZ. aka Hunters and Habitat hunting club in Taupo. they run the annual Sika competition. Good US mail order site for hunting stuff.  Great Us site to buy optics from.