Very common problem with Mini's. I used to shot them for the State Match Pistol and Rifle Team and all our brass used to look like that. We used to shoot Fed. Gold Match and Rem. Match. Still have several 5 gal buckets and it all looks like that. I just load it and go. Coyotes and Prairie Dogs don't notice it. Or at least they haven't said so!!! LMAO!!!!