RE: Tumbler ?
I have tried several things from brasso and oven drying to just tumbling, to not cleaning at all. It was just too much a pain for me.
Corn and walnut media leaves a residue. What I usually do is for established loads where I don't use a sharpie to write on the case, they have to be pretty dirty before I bother. But I will clean about every 2-3 fires.
But for load development, I use the corn media to take off the perm. marker and clean it to look for pressure signs.
sometimes I take pride in my shells, and make em look good.
Right now, you don't need a tumbler, but one day you will or it will be handy enough for ya.