I've used 9.5 grains of Unique with a 250 grain SWC cast bullet out of a Colt Anaconda, 8.5 grains of Unique with the same cast 250 SWC out of a S&W model 25. This may work for your Blackhawk, I use it in my model 92 20 grains of H110, 300 grain SWC or a 300 grain soft point jacketed bullet.. Have fun the 45 Colt is a fun caliber.


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