Varget and RL-15 will give you a bit more velocity and both are very temerature tolerant. I don't shoot long range, but these are my prefered 308 powders. H4895 is more temperature tolerant than IMR4895 or 4064. Other than any of those are good powders. Lots or good choices for a 308 really.
I've only used it with light weight (130 gr) bullets, but Ramshot TAC is supposed to be a very good 308 powder as well.
It depends on what is available in New Zealand.
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