I can see some use for an ultrasonic cleaner as it would take care of the primer pocket crud and all the fowling.
Bear in mind though, that while immaculate, the method wont do much about the roughened finish left from the chamber during the firing and extraction cycles.
Its use may extend the service life of media in your tumbler as well as some tumbler time though ... horse a piece I suppose.
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it just needs more voltage
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