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I check every piece of brass as it comes out of the tumbler. Any sign of splits or erosion - it gets tossed into the recycle box.
45 will last virtually forever, high pressure stuff like 357 or full house 44 mag - not so long.
Rifle brass in a tight chamber will usually neck split first.
Rifle brass in a sloppy chamber will crack at the web/case intersect.
Just give it a good look over. If it doesn't look or feel right, toss it.
After a while, you will know with a quick glance what's good and bad.