I had to recover a vehicle that had been completely submerged in a deep river for 2½ weeks. Inside was 20 rounds of 30-30 ammo (reloaded) The guy who owned the vehicle was dead, but his brother said to me, do you want them? I took them home and broke them all down, not because I was concerned about moisture, but because I do not trust another's reloads. Only one of the twenty had any moisture at all, and it was in the neck area. Turns out there was a scratch in the bullet jacket that had allowed a minute amount of moisture to enter. All would have fired, no problem. Regards, Eagleye.