I am well into double digits on some of my brass.  Anneal your case necks!  That will pay dividends in longevity!  The biggest problem I run into is cracking in the necks right at the lip.  Some cracks are very tiny and I don't really worry about them... but when the cracks start showing signs of gas leakage (i.e. carbon marks around the cracks) or the cracks are in the side wall of the neck, I immediately discard the brass - no sense tempting fate!!!