@JaydenMcN look up Belmont Ammunition. They have recenley started selling powders and have Action Rifle which is a St Marks military powder not previously released to the commercial market called 747. Powderhttp://belmontammo.co.nz/product-category/belmont-powder/
Decent prices and a burn rate that is 3% faster than Winchester 748. This powder was developed for 5.56 NATO so is perfect for the 223 Rem. Not much in the way of data so just take W748 and - 3% Hodgdon Reloading | Home
Very high load density and you know you will have a reliable source.
This is the biggest issue in NZ for relaoders, sourcing powders. best bet would be these guys followed by ADI.
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