i use to keep track till some new 44 mag brass split on me with a low end load, after that i figured any brass can expire at any time,
i have loaded some 50ae nickle over 5 times hot and so far no worn out cases,
as for 45acp you will loose most your cases before they expire.
i can get 3-5 reloads out of reformed 3006 cases to 8mm.
i will load in lots, say 500 from one batch of brass go shoot them clean them and reload them if i find some starting to fail ill trash that batch and get another lot out to shoot
might be right /wrong but it works for me for some time now.
hardest part is keeping up with your brass when hundreds of other brass at the range gets mixed in the bunch.
i do catch my 223 and 308 as i shoot mil brass mostly and i have a few extra hours in the prep work for them.