Brass cleaning process.. which is best

[Charlie-NY]

The only problem with SS pin tumbling is when you tumble too long. Tumbling brass for an hour or more will remove the beneficial carbon from inside of the necks. It can also ding up the case mouths. When I use the pin tumbler, I don't tumble for more than 20-30 minutes. I pin tumble all of the cases that come out of the AR, especially the 458SOCOM, which are filthy.

If you want super shiny cases by SS pin tumbling (longer), you should chamfer & debur the case mouths before reloading.