Originally Posted by startrek1761d
I would have to say the 6mm PPC, 308, 6.5 Swedish mauser and 222 are inherently accuate
And that's your opinion. However, there are no tests or validations in existence showing this. I'm not picking on you in saying this, just pointing out that there is no objective evidence regarding the "accurateness" of any caliber as compared to another. So, for you to ask which 270 is more accurate won't end up with a definitive conclusion. In a lot of searching I have never found a test for the accurateness of a cartridge, and the problem becomes that it would be extremely expensive to do.
The 6 BR and 6 PPC are used regularly to set records so you think they'd qualify. However, if there were mass produced rifles and mass produced ammo for them available at your local stores you'd see plenty of inaccurate shooting with these cartridges too.
High end custom rifles
with high end handloaded ammo produces repeatable and extreme accuracy.
To get back to your original question I have two very accurate Wby Vanguards in 270 Win right now, and they're a joy to shoot. I used to own a Savage 110 in 270WSM that was also a very accurate rifle, but it wasn't as much fun to shoot as it had a stiff, notchy bolt so it was sold. I would recommend finding the rifle you like and the caliber you prefer, then matching the two.