I can't comment with any hard data,as I don't have the rifle yet.
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<br>I fail to see how a case of that capacity,could not put some serious speed on a 100gr .257" projectile,assuming adequate barrel length. Mine will wear a 25" long tube and I'm thinkin' 3700fps is a reality.
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<br>My 25-06AI is of even less capacity(73grs) and grants 3600fps,via it's 24" tube(Re-22/100gr XLC). My guess is,the 257WSM will do quite nicely.
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<br>Before long,the guessin' will be over,as I fully intend to wring it out...............

Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."