I loaded a few commercial cast 255gr .452 swcbb in auto cases over Herco for use in my moon clip revolvers. I loaded 6 with 7gr and fired them without clips. They were pretty stout with a good bit of felt recoil. This was a little bit more than I was looking for with these loads and I have loaded a batch with 6gr. Cases from the 7gr loads were easily extracted with a fingernail and showed no signs of pressure. I was very pleased with the amount of case fill with this powder Anyone used Herco for this purpose......