Quick question. I recently started reloading and put my brass through a tumbler to make them shiny and get rid of the crud on the brass. I reloaded 60 of them and when I try to eject 8 of them won't catch and remain in the chamber. There is nothing to the naked eye that would suggest these wouldn't extract like the other 52 do. I was more less wondering what causes this, because I've never heard of it happening and would it be safe to shoot these rounds and then throw the brass away? Any comments are welcome.