Good choice on those projectiles, the 168 game kings are well suited to your 1in10 twist barrel. It should be a deadly combo out to about 500m.
I am also in Auckland, if you like i can show you the ropes or help you work up a load, just send me a PM.
I would load 3 rounds at , 44.5gr, 45.0gr , 45.5gr ,46.0gr using AR2208 and try them out, guarantee you will at the very least hit sub 1" groups if your rifle is right and you do your part, most rifles will be right about the 45.0gr mark with decent 165gr projectiles its not a hot load but works well, look for pressure signs but unlikely you will encounter any with this combo.
as for brass, Winchester is normally the best affordable brass but for hunting purposes any brass case will do. Buy Lapua if you can afford it, make sure that all your cases are the same brand though. Primers, any large rifle primer will do i prefer federal large rifle primers, no need for match primers.
Cheers
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