I keep my LC 5.56 sorted by year and by my personal lots. I want the ammo in a single group to be as identical as possible, including same number of loadings as Nick indicated. So I'll have a batch of LC77 once fired, a separate batch of LC77 twice fired, etc. I don't know how many different batches of LC I have going at the moment, probably 8 or so. Once I start loading a batch, that brass stays together in a group until it wears out.
This is for ammo loaded for service rifle competition. Iron sights up to 600 yards.
For plinking ammo, I mix and match odds and ends. Brass lots I don't have enough of to load a decent sized competition batch.