I'm currently working up loads for the Penn Bullet 185gr WC bullet in .44 Special. I'm hoping for an accurate and comfortable practice round out of a S&W 396 Mountain Lite, S&W 696-1, and S&W 691 custom.
Using a COL of 1.245" (I crimp in the small crimp groove with the sprue facing out, as recommended by Bob Palermo), I've found that 5.3gr of VihtaVuori N320, 4.9gr of Accurate #2, or 6.2gr of VihtaVuori N340 gives about 850 fps and satisfying accuracy. I'll also be working up a load using Unique in the near future, just because I know SOME people like using this old warrior...
STANDARD DISCLAIMER: These loads were safe in my gun, but may not be in yours. Never trust any load data from the internet including (especially) mine. Start low and work up slowly, looking for signs of excessive pressure. You are responsible for your own health and safety.