I looked in the archives first..I couldn't find a thread on primers falling out..I'm new to reloading and was loading .300 Rem Ultra Mag shells..the brass has been fired 3 times..I was charging powder and getting ready to seat bullets when I looked into the tray and saw a primer 91/2 M remington..Yes the Primer fell out!..OK..when I was seating the primer it felt alittle loose..this is the first time that the primer loaded with a loose feel and the first time ones fallin out..So I uncharged the case and of course thru the case away...What caused the primer pocket to enlarge?..Is this common on Mag rifles?..I even looked on the box of primer's to see if the manufacture had something to say..in regards to safety..One thing for sure anymore loose feel new primer's are going to put the case in the trash..Carl