I pick up a lot of brass from sales when the price is right. This is unknown origin brass. Sometimes I find stones, screws, mud wasp nests, etc. So, before adding the brass to my stocks I go overboard on the process. I actually enjoy the process. The sorting, the cleaning from mud crusted lumps to shiny good as new, feeds my OCD and gives me a sense of accomplishment. After a miserable day at work, processing some brass helps me unwind.
1. Maybe sort calibers, maybe run everything together. Run quick through the tumbler with SS pins, dawn, and citric acid. (if its a clean bunch of brass, I skip to step 3)
2. Then dry and sort by calibers into bags/bins.
3. Lube, size/deprime.
4. Another run through the tumbler to clean off the lube and clean out the primer pockets. Then dry.
5. Trim to length using lee gauges on the lyman prep center. (no trim on 32acp, 380acp, 9mm, 40, 45, 10mm) Then ream crimps if needed. Then chamfer/debur anything that got trimmed. Shorties go in another bin. I check the shorts at the end and if they are within 0.002" of my trim length I toss them into the processed bin. If shorter than SAMMI, they go in the scrap.
6. Then they go through the vibratory with corn/walnut and nufinish. This helps remove any brass shavings/burs that may have hidden away in the cases and leaves a bit of finish on the cases.
7. Then seal the brass in ziplocks with a note stating all the steps done and its ready to load. Then toss the bags into empty cat litter plastic buckets and stack them. I write the note at each step of the process so I always know what is in each bag laying around the house until it gets finished and stored away.