I prep (& load) batches of about 7,000 .308 for high level Palma competition.
I tumble 500 at a time in 25/52 grit walnut (doesn't clog flash-holes), treated with an ammonia-free auto metal polish. Now I've built my treadmill tumbler I guess I could stainless tumble them, but it would mean an extra pass through the press for the initial decap. Then they go through a rotary media separator, quick tumble in a towel, then garden blower.
Spray liquid lanolin + Alcohol lube in trays of 500. I've never found it to be expensive.
1st Press Pass: Decap, Small Base Body Die.
2nd Press Pass: Decap, CH4D Dillon Trim Die + RT1200 Trimmer, Sinclair expander die with floating .307 carbide mandrel. The CH4D die neck is chosen to match the brass neck thickness and ensure suitable sizing for subsequent expand.
De-lube in 25/52 grit walnut treated with (just a little) ammonia-free auto metal polish and just the right amount of mineral spirits.
If primer crimp swaging is required it's done as a extra press-pass before lubing.
You could probably combine some of the operations into fewer press-passes if you're not so concerned with getting minimum variation in shoulder placement, trim length etc. In the video below 50 cases were measured from 500 showing a 0.001" spread of trim length and shoulder position.
The loading video shows weighed-charges being dropped, but this is only really necessary for the longest distances (e.g. 1000 yards). An on-press thrower is more than sufficient for short range work or less demanding applications.
Some videos of my process in case there's anything useful in them:
Tumbling, Separation, Swaging:
Lubing Sizing & Trimming:
Loading:
Stainless Tumbling (optional):