That's great about the hinge lidded trash can. It must be working like a giant suppressor. Strange about not working at the range. I wonder if the powder is getting mixed in the grits during the trip and not burning the same. Of course, Unique is down about 32 powders on the burn rate chart. I've used faster powders like Bullseye or 700x or Red Dot or Clays, but I would start with a lighter load of those and work up until it does the trick.