Caliber determines much of the decision for me. As long as the primer pocket checks out and there is no signs of case separation, cracks or unusual deformation should be fine.
Many of us have a benchmark when it comes to number of reloads per caliber and know when it's time to recycle specific calibers and it will also depend largely on the manufacturer.
Depends what it is.
If it’s Verdi Gris (green corrosion) this is brass oxides forming, this can be just discolouration, but if there are pits and a white substance too, then it goes in the scrap bin.
If it’s black or brown spots, that is contaminant corrosion, like what happens if brass is left in a damp leather pouch or belt. This is harder to remove but poses no problem with integrity of the brass.
This is caused by the tanning salts/chemicals in the leather.
For stubborn stains, 0000 steel wool works fast to remove them.
Water marks are also easy to remove with steel wool.
Any brass with spots or green colored corrosion I tossed in a bucket. This bucket is almost full and with the component situation I decided to run it thru the vibratory cleaner.
I was surprised at the results.
Most cleaned well with the exception of dark stains on some.
I am curious as to the stain effect on loading.
Just trying to get all the life out of it.
Targets on these not hunting or PD ammo.
No pitting only discoloration.
Thanks for your experience.