I just bought some Sierra Pro hunters, sealed in the box that still had the old style label. Opened it up and these are now turning a darker copper color, maybe a little darker on the base. Still in good shape, but the jackets are turning a darker copper color. Should I just load and shoot, or do you worry about cleaning these up first. 130gr. 270 Hunting loads is what they'll be. But I want them to shoot good, and not foul the barrel.