I was given a couple of boxes of 30-30 Factory Ammunition that had spent several days at the bottom of the lake in a submerged pickup. Unwilling to take a chance, I pulled it all down to see how much moisture had entered. To my surprise, only two rounds showed any signs of water egress, and even they only had a bit that got by the neck of the case. The primers all went "bang" as well. I'm sure there is some virtue in sealing military ammo, but, for the life of me, I cannot imagine sealing any of my hunting ammo. Regards, Eagleye.