I had some issues with HS-6 in my Ruger (Super Blackhawk Bisley) .454. The lower pressure loads were leaving a few unburned or partially burned kernels. That gun is so tight that those were enough to tie up the gun making the cylinder difficult to turn. It has no issue with factory ammo or full pressure ammo with Win296. When I return to lighter loads some time in the future I'm going to look into cleaner burning powders. I like 2400, 4227, and HS-6, but all leave some "crud" behind and my gun does not like "crud."
Tom
