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I agree with Mike Irwin's assessment.
I've been using 231 ever since it was changes from 230. Used that too and was sad when it was changed out till I used the 'new' 231.
The word is that 231 and HP38 is the same thing. I haven't made a one on one comparison, yet. But as both come from the same place and with other sources, that I consider valid, I think I would use HP38 as a direct replacement.
It can be used for a full range of loads in just about every pistol round out there. I have read of a fella using it in a 300 AAC Blackout with sub-sonic loads.
For use in your 9MM, it will do the job. This doesn't degrade other powders, many of them do as well. Oh, hard magnum loads are better served with other powders like 2400, H110, 296 and others. But 9MMs don't fit into this class.
Be safe and enjoy,
OSOK
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