I will throw a story out related to this.
I fired some old reloaded 300 WM, maybe 15 years old at the time. I helped my dad load these and had fired some over the years so wasn't concerned. Over a few range trips, I used up 1 box. The next time out I moved to another box, same loads, same date on the reload sticker. First one the recoil was higher then I remembered, bolt was hard to open. I had the sense to stop.
When I got home pulled one bullet to see what was up. Green corrosion inside. I pulled all of them, some the powder wouldn't pour out. Once I got the powder out, I put a few drops of oil to deaden the primer. I decapped them all and squished the necks closed with channel locks to make them unusable in case someone ran across them. They went straight to the recycle bin and the powder helped fertilize my landscaping. I pulled apart 3 boxes of ammo from the same reload lot. Some were ok, some were corroded.
I was lucky, but wouldn't think to reload cases with signs of corrosion.