For virgin brass I always de-burr the flash hole and full length resize them. For subsequent firings, Lube the inside of the case necks and then lube the outside. Wipe excess of neck/shoulder area to prevent dimples in shoulder area. Neck size enough to bump the shoulder for easy chambering. clean the primer pocket with the RCBS primer pocket brush. If needed: trim to same length then deburr in/outside of mouth.
Then I take a soft bristle nylon brush that easily fits in the case, but wide enough diameter to brush the inside of the case. I twist this brush back and forth about two-three swipes and this not only cleans out a lot of the carbon deposits inside the case but also removes most of the lube from inside the neck. I wipe this brush off after ever twenty rounds to somewhat "freshen" it up.
If the cases need annealing I will do it now and after they are dry I will bag them up and label them (Fired once, trimmed, prepped and annealled, etc). I keep notes in all my case bags so I know how many firings they're at and at what stage of prepping they're in.
I have a smaller bag inside of another bag. The big one for "stock" (i.e. 2nd firing). These get prepped, loaded and shot first. The small one for after they've been fired (i.e. now 3rd firing).
This system works well for me.
I try to buy my brass for a particular caliber at the same time so I can keep up with this info. I rarely use someone else's brass as I never know the level of use or abuse (hot loads).
"For 300 WSM
and other rounds that won't feed unless full-length resized:"
Never heard of this.