You may want to go with stainless steel pins, warm water, some lemon shine and a little Dawn liquid soap in a Thumlers Tumbler or a Frankford Arsenal tumbler.
The old days of breathing in walnut dust are over. Do yourself a favor and upgrade to steel pins and water, you will be amazed. The time you save will pay for the new units.
https://www.amazon.ca/Thumler-Lapid...hvlocphy=&hvtargid=pla-4584345030799920&psc=1
https://www.cabelas.ca/product/66173/frankford-arsenal-platinum-series-rotary-tumbler-kit
https://www.frankfordarsenal.com/case-cleaning/rotary-tumbler-lite/1097878.html
Seeing you already wash your dirty brass, using this new method will forever change your life. The clean and polished brass from these tumblers are absolutely incredible to say the least. The results are brass that is good as new, or even better than new!
I've been loading for over 45 years now. The time I lost with those old RCBS tumblers with walnut media is colossal. Not to mention all that blasted dust. No more dust, wiping each brass individually, adding fresh additive or long wait times. If you load a lot, you owe it to yourself to upgrade.
I even sold my older used equipment to recoup some of the new costs. That was twelve years ago now since I started the stainless steel pin method, I wish I would have learned about it sooner.....