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The pressure limits for the 40SW are just under 33,000 psi. You'll never see any flat primers at that pressure and if you do, you're living on the edge. I wonder why you chose the AA#9 powder though considering Accurate doesn't recommend it for the 40. It's too slow and that what I see in your brass- too slow powder used which is going to throw the pistol slightly out of time. If you're looking for premium performance that is ideal for the 40, look to Power Pistol powder.
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