I don't reload 9mm but I don't see too many loads for 800-X for 9mm - none in the lyman manual & only a couple in the lee book. I have used 800-X in .40. if you use 800-X you will find it doesnt meter very well - I measured each charge - but I would say every 5th or so charge from the measure was way under weight. I wouldn't buy 4lbs of that before trying a pound first. A pound of powder for either of those rounds should give you between 700 to 1000 rounds.

I do like AA#7 & Power Pistol for the .40 - the 800-x load I used was very accurate however I did measure each load

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Steve