My A5 seems ok but now that you mention it I did see some particles on my shell plate. I thought this happened due to too quick movement of it at the end of that run. I recently oiled my ram and the small amount of powder down there did bar up. Other than that I have never observed any problems with A5.
Jim
Edit.
As we speak I am loading with A5 and discovered my leak issue. I use an RCBS powder measure and found that the connecting thumb screw was just a little too tight. This caused the powder drop gizmo to stick in the barrel, instead of sliding up and down with each cycle. Dont know if this relates much to what`s happening with you except for the fact that A5 is fine grain.