There is one nugget that I left out and it seems nobody has addressed…
A couple years ago, the Hodgdon Universal that is packaged and sold changed from Australian production to Canada.
I buy 8-pounders only… in any/every powder I use, except Power Pistol (arrgh!!!) and so I had a good stock of my Universal before this change.
I have never used the current Canadian Universal. Is it different? Could it be different? NO IDEA. But it is relevant to the conversation.
I've had plenty of experience with powders that meter lousy. Red Dot, Green Dot, neither runs great for me. Unique is awful. IMR-800X probably wins the title for worst I have ever tried when it comes to dropping charges from my Lyman 55.
Universal gives me no hassles.
I used Clays for many years. No problems at all in my shotshell loads metering in a MEC 9000 progressive.
10's of thousands of rounds.
This was the Australian mfg stuff.
Then they had the fire at the Australian plant that mfg'd the stuff.
I had enough 8#'ders of the powder to hold me thru till the 'new' Clays came available a couple yrs later.
I bought an 8# jug of the new Canadian mfg Clays.
I used it once to try and load some shells.
I had nothing but bridged powder in the drop tube problems & light drops.
After messing with the stuff a couple of times I finally dumped the bottle back into the jug of powder and to this day it's still sits un-used.
I managed to load approx 1 box of 25rds with it.
It seems awfully 'fluffy' compared to the Clays I was used to handling and loading for all those yrs.
It just won't work through the metering bar or a Lyman 55 either. Thought I would use it in pistol loads. Guess it'll be LEE scoop measures to get rid of the 8 pounds at 3 or 4 grains at a time.
I switched over to Alliant Clay Dot powder as my 12ga powder with no issues at all. Same powder bushing.
Maybe the Universal (Clays?) in question suffers from the same problem as the Clays powder I have.