I have used AA2 with a 115 grain JHP bullet in 9 mm. My OAL was 1.080" This is shorter than you would use for a FMJ. 4.0 grains wouldn't cycle my pistols. 4.2 grains would if you kept a very good solid grip on them. It took 4.4 grains of powder to cycle properly. I prefer using AA5 powder in 9 mm of the two powders you mention.
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