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Get a media separator like this :
Frankford Rotary Separator Kit

Fill the bucket with water, empty the tumbler contents into the separator and rotate a few times, all the pins fall to the bottom....

There's loads of differing opinions, but personally speaking I've found it a lot quicker to wet tumble than dry tumble. Mainly because you only need to tumble for a shorter time, and even including...

:thumbsup:

I've got one like this :
Food Dehydrator Round Adjustable Removable Trays | Trade Me

Does hundreds of 9mm and quite a few 223 on multiple trays.

52364

Def wet tumbling with stainless steel pins. If you're building your own just make sure it has a water tight seal, nothing worse than a puddle of water on the floor :D

Doesn't need to go stupidly...