AA#7 - How dirty is it?

I've tried AA#7 a few times over the years in various open guns but have steered away from it each time due to it being dirty and worried that it would hurt the reliability of my gun. Earlier this year, I worked up some major PF 9 loads for my CK gun with MG 115 & 124's. Gun tracked great with these loads, but I had 1 malfunction where some of the unburnt particles got into my trigger bow area and limiting trigger travel so that I could not break shot. Not for me... I found the

Let's talk about powder spillage... AA#7 is a super fine grain powder that leaks quite a bit around my powder bar causing: -inconsistent charge weights -mess/waste with powder spillage -jams up movement of powder bar -damages/galls powder bar I tried my Arendondo powder bar that is a tighter fit and this helped some. Solved this problem completely when I was loading another fine grain powder (True Blue), but was not quite enough for AA#7 on my equipment (Dill