All I have is the Powley formulas. It shows a 100 gr out of a .257 WSM at 3463 using 70.5 gr of imr 7828 with a 25" bbl at 44987 psi.
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<br>So if you can get that much RL 25 into the case the velocity will be higher than 3500 it seems. That's well ahead of the 25/06 and into .257 Weatherby terrritory and without the freebore but with a shorter rifle.
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<br>I really feel that this WSM case is one of the best things to come along in a very long time.
