You haven't said what you want to shoot. If its paper then please disregard the rest of this.
I suggest you check out Nathan's info at "Terminal Ballistics". I like his research and it often answers questions about a projectiles performance regarding the range / velocity and the size animal it is intended for. I'm not a fan of the ADI powders - but each to his own.
I'll just pass on Nathan's comment in that you should anneal the 150gn SST and it it will need to be reaching 2900fps or better to be a great load.
This information might help you determine the powder that you use.
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