I had that happen a few years ago with my Uniflow and after I went to lengths trying to clean it I came up with the opinion that if I couldn't scrub them out, then they weren't going to fall out on their own. I left the grains right there and refilled it with whatever I wanted to use at the time. I'm still here, so nothing catastrophic has happened yet.

MarkWhite, soap and water does absolutely jack squat. It's no big deal, I've already got it completely disassembled with the drum out etc. so I'll just get after it with a screwdriver and clean it out then maybe run around the inside of it with a stove lighter where the canister and metal meet to burn out any remaining grains that might be hiding in there, doubt there will be any.

Finally got around to scraping out the dispenser last night. With a screwdriver it all came out fairly easily except for few grains in the bottom of the dispenser. Just wish I didn't have a pitted, discolored dispenser, but there are worse things.

Thanks for all the info. I'll be more mindful about leaving powder in the dispenser from here on out. I've been loading for years. I'm surprised this is the first time it's happened.

If you mount a dry erase board on the wall, then you can log the powder type, cailiber in the press, primer type in the primer tube and any relevant notes. I have a bad habit of leaving powder in my press (Dillon 550B)and have noticed that the blue hopper has taken on a yellow tone but no sticking or erosion. I would get a new powder measure and chaulk it up as a lesson learned.