I have a weird question, not sure if this is the right place for this, but here goes. I have a savage ar10 in .308 set up with thermal for hog extermination. Currently, I’m using Barnes factory ammo - 168 grain ttsx. I keep several magpul magazines loaded for quick access. The magazines that I sore in my ammo cabinet or in my hunting bag are fine. But if I keep a magazine in or anywhere near the gun, the ammo tarnishes like crazy. Not only does it look bad, if I fire it, it won’t extract. I had to take a rod down the barrel and pound it out. The last magazine that tarnishes was stores by the gun in my gun safe that has a golden rod in it, so it shouldn’t be humidity causing it. My ammo cabinet is just a cabinet in my house, and it doesn’t happen there. What gives? I’m tired of wasting expensive ammo. The one on top was in the chamber. The other two were in the magazine. Could it be the oil I used on the bcg causing this?