8 grains of Universal or Unique is the go to load for .45 Colt under a 250 grain bullet. It approximates the ballistics of the original black powder load. Your load is way under that. You probably are not generating enough pressure to get the powder to burn properly.
Roger
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Trigger control + Breath control + Sight alignment = Gun Control.
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NRA Smallbore Prone Master, High Power Master
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