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Enjoy the gun; I love mine.
If you aren't getting the slide to cycle then you are no where near max pressure. I shoot 147 gr FMJ-TC with 4.2 gr of Power Pistol at an OAL of 1.135. That's a power factor of about 132. My minimum load is 3.9 which didn't always cycle the slide because of charge variation, which is why I bumped it up to 4.0 at first. That gave me a PF of 125, which is the minimum for USPSA production or ESP/SSP in IDPA.
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What you are saying does not apply to heavy bullets under extremely fast powders. You are using a slow burning stable powder that is as far away from Clays as it gets.
Really fast powders make minimum power factor at close to max pressures. Clays has to produce a sharp pressure wave to get the bullet to move. Sometimes it's necessary to respring the gun.
It's a nice soft .45 powder. But not for 9mm with 135 gr and 147 gr bullets.