I would not have thought any hammer forged barrel would wear much different to another of similar steels, carbon, stainless and gradings etc.. When you say 6.5 wearing out barrels and a 270 isn't, are you talking 6.5x55 or is he running 6.5PRC because one would expect better barrel life from the 270Win in any brand barrel, Sako, Blaser, Mauser or otherwise. Even 6.5 Creedmoor gives up a lot of barrel life compared to the good old 308. I would like to see how a Sako and Blaser barrels of the same caliber and shooting intensity hold up when head to head.
We use to shoot Sako 222 barrels almost smooth culling roos and 222 isn't a barrel burner, there is always a story to slant it either way

Now as a Blaser owner I could be seen as biased however, I really like the new Sako 90 Peak.
On another note, my Blaser barrels clean super easy but so have my Sako barrels, most hammer forged barrels will, they just didn't foul in the first place.
Cheers
John