Only Done this for Pistol Brass . I never tried it for Rifle Brass, and it might even translate over well for rifle ? , never tried .
Not high tech. but Easy, Real Fast way simple to separate SS pin media, and been doing this way for several years now ( for pistol brass ) I just use a big cut piece of 1/4"hole Nylon Mesh .
Lay the Mesh in the plastic tub .
Dump a pile of wet brass into Mesh . All water runs into Pan .
Pick up mesh with wet Brass with pins inside . Grab all 4 corners (2 corners for each hand) and hold over a big plastic tub .
'Slowly' roll up-down / right hand and left holding 2 corners each / going up & down, bending at the elbows .
And All the SS Pins just just falls into the tub as you roll brass in the Mesh .
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