With normal barrel lengths and 150 grain bullets there is little difference between the two cartridges out to 350 metres, beyond that the .30/06 is a bit flatter, and can be handloaded to about 3000 fps with 150 grainers. If you are going with the short barrel then stick with the .308. The .30/06 is better with heavier bullets but they are really not needed in NZ unless you are looking at specialised long range work, in which case your shorter barrel would not produce the required velocities anyway. I use .30/06 150 grain factory loads for hunting, and for long range targets in my 26"custom LR rifle I run 168 grain boat-tail match handloads at 2950 fps.
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