It's been my experience, both with pistol and rifle, that the quicker powders lose less velocity in shorter barrels than the slower ones, though they start with less to lose. There is definitely less flash and bang to them.
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Aren't typical magnum loads for it about 14.5 to 15 grains?
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My books show max loads of 11.5-13.5 for AA9 and 158's.