I have some and use it for rifle cases it cleans inside the cases and the primer pockets. IMO it is overkill for straight wall cases because of the extra work.
It does do a very superior job in hard to reach places.
Separation is the problem as noted. It passes through an ordinary sieve. I have no problem separating it from the cases by tumbling them wet in my RCBS separator. I dry the cases in the Sun then put them in the separator a second time.
Getting the dirty water out of the media, rinsing the media and then getting the media reasonably dry for storage is a problem.
I have a 24” square piece of SS wire cloth in a frame which I use for cleaning small parts, I don’t know what mesh it is about 400, I can strain the media on it. Handling it is a PITA it does stick to everything when it’s wet, even a plastic bucket.

__________________
Ipsis Rebus Dictantitbus