[legion]

Case tumbling?

It's a personal preference. The vibratory tumblers really only clean the outside of the cases, so it's mostly an aesthetic thing.

Now for the microscopically anal, get yourself an ultrasonic cleaner. It will clean the whole case (with the right cleaning solution). I always deprime before cleaning--primer pockets get dirty too. Hornady has a decent one for around $80, but you can find it for cheaper on Amazon (without the Hornady brand on it).

If you are shooting bottle-necked rifle cases, they will stretch every time you fire them. You will need to invest in case trimming equipment. I recommend the Hornady Cam-Lock unit for precision trimming, and the Lee zip trimmer for "good enough" plinking ammo.

Oh, and some other miscellaneous things...

You might consider a flash hole deburring tool (I use one from Lyman) for precision loads. It creates a little cone around the flash hole so that any metal burrs don't block/retard ignition from the primer. Gives more consistent ignition to your brass. I skip this for plinking loads.

And finally, consider getting a crimp remover if you want to shoot military brass.