Perhaps you should keep your 100yd zero.
That gives an effective "aim bang on" range of 150m for a tennis ball sized target. You dont want to be estimatng and trying to aim 8 cm low for mid range targets when you havent been used to doing it in the past. As said above, the majority of successful shots at tahr are under 200m. from 150 to 250m you need to make some sort of call - eg is it closer to 200 or 300 ? Beyond 250m you need a rangefinder and use a drop chart.
Glass is very important and as you hunt in the ureweras i'm guessing you arent using a dial up scope. Supposing youve got 6 or 7x at the top end, I suggest not to get another scope just use what you're familar with.
The milk bottle practice idea is good and also put a few on paper first to see where you are. Know your limits in wind and awkward shooting and dont be afraid to pass on a 400m shot if it doesnt look good. You'll get your whack if you can shoot solid to 200.
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