Guys, probably a dumb question. I just bought my first box of 30-30 lever evolution last night from an established gun shop in the area. When I looked at the ammo today, I noticed that several of the cases were very tarnished, and the case heads were headstamped "Frontier" I haven't got around to shooting any of it yet. I'm sure it will perform as well as advertised, and it's just cosmetic, but I'm just not used to new factory loaded ammo looking like I already carried it around in a coat pocket for 20 years. Has anyone else had this same experience, or did I possible get a bad box of ammo?