You can safely go as low as 6.0gr W231 with a 200gr Cast bullet in the .45 Colt. A 7.0gr load will be a middle of the road load since the recommended Max charge from Hodgdon is 8.0gr under a 200gr LRNFP bullet. I don't use Unique because it's a little slower of a powder than I'm looking for in light loads and it doesn't meter well at all. W231/HP-38 meters great since it's a ball powder.
Trail Boss isn't a bad choice either since it was developed to fill the old Black Powder cases that are so large. It's perfect for Cowboy Action velocities.
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SWCA #3437
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