I use a media separator filled with water two inches from the top of the base and spin the brass with the majority of the pins submerged in the water. This makes the pins flow out of the case mouth along with the water. Then the cases are tumbled back and forth in a large bath towel to shake any excess water out of the cases. And as a example the last time I did this I found one pin in the towel. After drying the cases with heat, the flash holes and inside of the case is inspected.
I find the wet SS media tumbling much faster than pushing stuck walnut or corn cob media out of flash holes.
Bottom line the media separator when filled with water helps greatly in removing the pins from inside the case.