I have about 500 rounds of Argentinian 7.62 Nato surplus. I have used it in the past in my FAL and it works great. I recently picked up some more and as I was inspecting them I noticed some have a loose bullet. It is not loose where you can push it in or pull it out. To be honest you can't see it move, you can just feel it click back and forth if you grab the case in one hand and the bullet it in the other. It is a very small amount. I never noticed it on other rounds but some others could have had the same thing and I just never noticed it. Should I pull these and put them in new cases? Should I crimp down the cases and tighten it up? Should I shut up and shoot them?