Thanks for the reminder; glad he's alright!
I don't know who else does this, but the first thing I do when starting a new batch of anything (aside from shotgun stuff) is check to see if it's even possible to double charge a case with the powder/powder charge I'm using. If it doesn't spill over...
Just chipping in here... if and when you burn up your Unique, consider giving True Blue a try. I kid you not, that stuff meters on a powder drop as well as my fx-120i can measure out individually.
I don't have any loose, but I bring myself to part with a handful of factory Black Hills 5.56 77TMKs if ya can't find any here. Why are TMKs practically impossible to find? Did they stop making them?
Keep a close eye on Powder Valley. They had some yesterday and have been dropping Alliant the past few days. Ya sure gotta be quick and good with the refresh button, though.
Those are probably gonna be tough to find. Here's an alternative if you don't have any luck...
https://www.sportsmanfulfillment.com/hornady-22241-22-cal-224-40-gr-v-max-100-ct/