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308 is extremely versatile, with Roberts 151gr hollow points and trailboss make great subsonic loads and sub-x is available commercially if hand loading isn't your thing
Not to mention the...

use to be 303s held in the same regard here in nz
times are changing, but a 303 would still do the job just fine

nothing wrong with a medium sized cal like 6.5creed/260rem or the close relatives 7mm08/243/308
its all thats really needed for NZ hunting

standard sporter or light weight barrel would be my...