I don't know that the accurate barrel life of a 6.5x06 would be 'better' than any, but certainly would be worse than some.
A 260AI is loaded to the same accurate nodes, with the same bullets and powders, but using ~10gr less powder. So it's barrel life, and IMO pretty much everything else about it, is better.
You can see this at reloadersnest.
The Rifle Section @ www.reloadersnest.com
Keep in mind that barrel life, and accurate barrel life are completely different.
Truly, 'barrel life' in itself, is as long as you can still fire bullets out of it.. And many folks don't understand accuracy, qualifying of it, or recognition of it's degradation.
With this, there are always wild claims to filter through.
There are some here who actually reach peak load potentials, and can spot loss of that accuracy, to the shooting session. The rest chase their tails until it's undeniable..
If I really loved use of a 6.5x06 cartridge, I would get a barrel for one melonite treated, to pretty much remove barrel life as a concern. This, provided carbon is well managed.