Can't speak for North Island, but none of my hunting in the South Island is bush hunting. It's rare for me to ever take a shot below 150m (for which the low-end magnification on a 3-9's, 3-15's, 4.5-14's is enough, sure)... But the high-end makes precise aim (especially on the more typical 300-400m shots) a lot easier.
E.g. I can clearly see and select the part of the pig or the wallaby that I want to shoot, and can then dial up and hit it pretty reliably with a high power scope. With much less than 8x, the thickness of the crosshair might be largely obscuring what I'm aiming at and I feel like I'd be falling back to the old "just put the crosshair on the animal and pull the trigger" method which doesn't satisfy the inner perfectionist.
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