The ss media from PelletsLLC.com is magnetic but does not rust. I use a cheap rotary spinner (Franklin maybe?) whose bucket is sitting in one of the large plastic storage bins from Wallyworld, Target, etc.
Pour all but 1/2 cup of the water out from the bucket and dump the remainder with the pins back into the tumbler. Maybe 10 pins per use will end up in the storage bin where a fridge magnet is quite adequate to grab them all.
BTW, the sink I pour into when rinsing is porcelain over iron (big old set tub). Every now and then a pin will stick in a primer hole and not come out until the rinse. To keep those out of the drain I cut up yet another flat, wide fridge magnet (2008 local Democratic candidates I think) into a few thin strips that stick on the sink bottom and "guard" the drain.
/Bryan