I'm the psyco!!
I do my case cleaning before reloading.Why run all that range grit though the dies?
I do not care a drip about shiny,only clean.
With good load density in the powder charge,I will vibrate them briefly in corn cob to de-lube.
The issue that would concern me is prolonged tumbling,especially with low load density.
Burn characteristics are controlled by the propellant coatings.If tumbling alters the coating,it could alter performance.
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