Media?
The short answer is Walnut will clean faster, corn cob will leave a more polished surface. Either works. It just depends on how bright you want your cases. Brightness is nice but clean is is necessary to save wear on your dies. AS to how long it will last. Over the years I have noted some walnut can be used longer than other lots. Another consideration is how dirty your cases are. if you use a real dirty powder, it stands to reason your media will not last as long. So,, It's personal choice for the type of media and the length of use is just to varied to give a meningfull answer.
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