So, I unloaded open carry since I haven't gotten a ccw yet. But anyways, I have a clip I keep in a belt holster next to my xd40. I haven't been to the range lately (so I haven't rotated them out) and have had the same ammo in my clip for a while now. Randomly selected from 2 boxes of Federal FMJFN that shot good. Now I'm gonna go out and get me a box of hp's. Its not really a problem, but my ammo isn't nice and shiny anymore. Can I use a brass/metal polish on the first 2 rounds to keep em shiny or will that cause feed problems?