With the unburned powder clue, the first thing I would check is the crimp. Velocities are rarely close to those found in reloading manuals, but they are a good guide. However, 200 fps is too far off to be a fluke. Are you applying a good strong rolled crimp?
Which 45 Colt die set are you using? Is it appropriate for the chamber and bore size of the SRH?
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