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With your 185gr XTP and SR 4756, hornadys manual says 8.2-9.1gr...... COAL is 1.225
So your load wasn't super low, more mid range, but apparently not enough to cycle the glock.... more powder or a lighter recoil spring are in order perhaps....
I dont know if your too short OAL had anything to do with it.... You might try the same charge with the correct COAL and see what happens....
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