When I first started to reload back around 1975, I used 4.6 grains of Unique and a Speer or Hornady 158 grain SWC or RN. That load worked fine and I never had any problems. That is a good load for beginners. I was told that beginners should use Unique and that they should not start with using Bullseye (for safety reasons) Since then, I have loaded and shot many thousands of loads that were hotter than this load( some times using Unique, sometimes using other powders) If you are using a modern 38/357 revolver made by one of one of the major manufacturers, 5.5 grains of Unique with a 158 grain bullet, will be rather hot, but it won't blow your revolver up. I would not want to shoot a steady diet of this load simply because lighter loads are more fun to shoot.