I've got a 25-06 and a 6.5x55.
The 25 is very flat shooting and pushes a 100gr bullet out at 3,300+ fps and knocks over medium size deer (fallow) with ease at 300m and I shoot a fair few at that distance+. However, the lighter bullets are affected to an extent by wind.
The 6.5x55 is slower but is a very effective calibre and you can get a far greater range of bullets for the 6.5 which gives you far more flexability (100gr - 160gr). The recoil is very mild even without a moderator and it has far less 'bark' that the 06 or the 270.
I'd thoroughly recomend either calibre over a 270 and ammunition for both was easily available last time I was in NZ, but I would recomend you stick a mod on the end!
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