Easy Peezy does it...'Easy Pickins'
Dump the bowl onto a cookie sheet in a pile in the middle, PC, BB's and casts all together...
Grab the sheet on the narrow end and pull it back and forth on the bench top several times...
All the casts will roll out sideways to each other...as they roll out in the PC, any dings or blemishes will re-coat themselves especially on the drive bands where it matters most.
Now you can tweezer them or grab them with gloved hand and stack them quick.
They will point in two directions...after picking all the convenient ones just flip the sheet around 180* and pick the remainder.