Free: Contests & Raffles.
Walnut shells with some polishing compound mixed in. They are very easy to dump out. Once I do a preliminary dump I put all the casings in a colander and blow them off quickly with compressed air before resizing to get rid of any errant shell bits.
Or try a universal de capping die to clean the flash holes after tumbling. Or clean before resizing
These are wet tumblers, right?How do you dry the brass inside and out after you remove it? Seems messy...