Re: Cleaning case question...
Case cleaning, for me, is soot removal from neck and shoulder.
I have a spray bottle with dilute vinegar solution that I spray on to dampen the media and agitate for several minutes before adding the brass. Damp media and vinegar combine to do a far quicker and more effective, yet still safe, brass cleaning technique.
I let the media absorb the moisture before adding the brass so any swelling that may occur with the media takes place before it gets into the cases and packs their interiors solid.
Once the grand majority of the soot is gone, I cut the motor and separate out the media.
I have substituted diluted CLR for the vinegar. It works even better, I just don't have it handy all the time.
After several vinegar, etc. applications, the media simply needs to be dampened with plain water to get the same effect.
Once, I cleaned the brass in the CLR/media combo, simply left it in the idle tumbler overnight, and something very interesting happened. The brass developed a flat olive-green patina.
It was relatively durable, and survived handloading and firing, but would come off under moderately serious cleaning/polishing.
Also works with copper bullet jackets.
As far as I could tell it had no negative consequences.
Greg