Dougie is right that in the field you will need to be ready to shoot quickly and in a variety of uncomfortable positions
A 270 is a good calibre - keep some dollars in ya budget to suppress it if the kick gives you a flinch. Check factory ammo prices for 270 vs 308 if the price diff is a problem then consider a 308 or an AK47 shortie round - they're cheap as.
A mate I shoot with has a 270 and at the end of the day the calibre used is one small factor. I think that the biggest factor is the operator's familiarity with their own gear, the terrain and the animals they're after.
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