I’ve been using stainless media since 2010, couldn’t tell you how many 1000’s of rounds I’ve loaded from .17 to .50 and never had an issue with pins being left in the case.
I use the Frankford bucket and tombola separator (or whatever it’s called) and this does the trick providing the brass is rotated under the water (bucket full to the brim). My loading process is then anneal, size, trim and then finally clean in hot water and fairy liquid. I have no doubts that even if one pin should escape the initial separation, by the end of the process they most certainly will be all gone.