Below is a picture of brass recently fired from my 308 Savage. The middle two pieces are Hornady match 308 168gr bthp. The outside are different manufacturers.
This is my first time cleaning brass so I don't know if this happened before. However, almost all the Hornady ammo shot yesterday had this blackend discoloration. the pic was taken after tumbling and hand wiping with a clean rag. A couple questions:
1. what causes this? I assume since almost exclusively inthe 50+ shots I took yesterday, all the Hornady brass shows this on the neck. The other brass (a Federal gold and some Lack City brass reloaded by Chad) did not show any of this.
2. Is this something that I should be concerned with?