All info very interesting. I load 38, and I use a plated bullet. Mostly 158g.
About the brass, I do separate them by Manuf, because they do not weigh the same. As a quick check of the finished cartridge, I weigh each one.
If they are not the same, or very very close, something is wrong. During this process, I noted that all empty cases do not weigh the same, hence I keep them separate by Manuf. So it goes. R