Id gather she's fairly close to 26 Nosler performance... probably a tad bit better barrel life. I've heard 1200 down to 300 rounds with the 26 Noslers. Don't really care in all honesty. I doubt either of mine will ever reach 500 rounds each in the next 5 years.
Barrel life calculators I have found online seem to be estimating right around 440 rounds.... still would love to know if they used basic numbers on temp/pressure/etc.... or did they factor any other variables in there (shot string average/neglect,etc)
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The 6.5s are making one heck of a play in the US. Weatherby is doing something right by bringing it to the table....