I acquired a case of Port 7.62 in battle packs that looks like it was stored wrong and got wet. There is tarnish/corrosion on about 250 of the rounds. Some rounds are just a spot or two and some of the cases are halfway covered in this tarnish/corrosion. It looks like most of it is on the surface and would clean off nicely with some steel wool. My question is are these generally safe to shoot?