Hey everyone, haven't posted in awhile but I hope you can help me out. I have some Federal .22lr ammo (the 525 round box) that I bought from Cabelas in January, used about half of it at that time and kept the other half in the box it came in. I've had it stored in a dry place since then. Took it out the other day and found the copper plated lead is turning a shinny black. Does anyone know if this is bad, nothing to be really concerned about or otherwise? Thanks for reading, and any info is greatly appreciated.