I'm not convinced the sorter will separate the 9mm from the 380 since they are the same diameter just a couple thousandths difference in length. I too stand them up and look at the length. Also I can eye them and get most of the 380 out when dumping them out of the tumbler. Not all though.
for fun you can put 380 brass upside down in a 40s&w and load only with a primer and shoot them at cans in your garage !!! they don't ricochet like a bullet and if they come back at ya it don't sting at all yes eye protection is a requirement