I started with Unique for light loads in the 41 mag, sub 800 fps. Unique left the cylinder face and muzzle caked with carbon.

Went to Blue Dot instead. Manufacturer said no Blue Dot in the 41. (I don't believe light loads like mine were ever an issue.)

Adopted SR 4756 for light loads. Manufacturer discontinued it.

Switched to HS 6. It works well for me all the way to 12 gr with a 210 in the 41. But that is not sub 800 fps. I typically use Tite Group or Universal in the ultra light loads these days.

People who choose to brew up their own storms bitch loudest about the rain.