I did not know what these critters are so I did a google search and found this:
http://www.redstag-hunting.com/tahr_hunting.htm
From that article they say:
Quote:
A mature Bull can weigh up to 300lbs and can be tough to put down, so we recommend a heavier caliber rifle like the 7mm mags, 300win mags through to the .338 as being ideal.
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Now, that is only one reference but a 25-06 with the best bullet will never have the knockdown of a 7mm Rem Mag much less a 300 or 338 Win Mag. Accordingly, I would suggest looking around more as it sounds like the 25-06 may be less gun then you want.
Now, with that said, I do like the trophy bonded bear claw bullets and I used them in my own 300 Win Mag and they shot quite well. I never got to harvest anything with then (I used the 300 Win Mag to hunt Black Bear here in Pennsylvania).
Good Luck, but it sounds like a bigger gun might be in order.
Here are some more links....
http://www.rifleshootermag.com/featu...05/index2.html
http://www.adventuresinhunting.com/h...cNWZealand.php