multistage
New member
I have about 350 rounds of 300 H&H brass that has small, dark spots on most of the cases. I haven't loaded any for quite a while. Most of this brass is about 10 years old, and none of it has ever been loaded. I pulled it out today and find these dark spots on most of the cases. I ran a batch through the tumbler, but the spots remain. Is this corrosion? Can I load this stuff? I'd hate to chuck 350 rounds of virgin 300 H&H brass, Winchester brass to boot.