When I start loading I'm usually starting with once-fired brass.I find the great majority has very little run out.The ones that have a lot of run out,I mark and get rid of them if they are really higher,like double the amount of the majority.After four or five loadings of the same brass,the brass will start getting harder.At that time I also notice more run out on brass that previously didn't show much run out.Probably some of the run out may be caused from harder bullet seating in the hardened brass.Annealing the brass would probably help a bit with the run out,but if the brass is cheap enough I usually just get rid of it.

~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............