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W231/HP38 would be a good powder to cross over into .40 S&W, as well.
But, I think Unique is a better "beginner" powder. It's very pressure-tolerant in 9mm (even if it runs dirty in low pressure loads), it has a fairly broad charge range, and it is not primer sensitive. (accidentally using the wrong primer won't cause significant pressure changes)
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Don't even try it. It's even worse than the internet would lead you to believe.
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