Some think this is a stupid question, so here's why it was asked. I've been reloading for 50+ years, for the first 30 I never saw a case tumbler or even mention of one it reloading manuals. The first mention of them were for pistol cases. It seems that case tumbling popularity is coinciding with the popularity of the AR platform and high volume shooting.
I load for 18 different cartridges, I have to make brass for 5 of them.
1. I never load in batches larger than 50
2. I don't think I have more than 300 rounds of brass for any one cartridge
3. My brass is always clean before reloading, just not shiny
4. I have no problems annealing brass that isn't shiny, in fact I do it at the kitchen counter without stinking up the house. Some brass that I'm forming has to be annealed a couple of times during the process
5. My brass is handled individually through the reloading process, primer pocket cleaning, lubing, sizing, wiping down any case lube, trimming, chamfering, priming and loading. I don't miss flaws. I find prepping brass cathartic.
6. MY ammo shoots exceedingly well
7. I have no problems with case separation, misfires, ruined dies and have yet to meet a barrel that if it wasn't damaged wouldn't shoot a usable hunting group.
So my question, thank you all for your answers and now I know it will only make shiny brass for me and is another thing I don't have to get. I have my first semi auto that I'm loading for and thought there was something I might be missing.
Thank you
AWS