Winchester Staball HD Load Data

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Nice! Right between 8133 and retumbo on the chart! And it's a high density ball powder!!!!! This could be a very good thing. I can see it being very very useful in the 257 wby shooting 115 grains and up, especially with a fast twist to take the 134 eld m 135 Berger 140 chinchaga and black hole bullets.
It is. Very useful. Running 133 Bergers, 134 Hornadys, and 145gr Black Holes with it in modified .264/.257 Win Mag (called .250 MDC)
 

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