I took a very cautious approach to 9 major over a year ago. I only used once fired, one headstamp brass. It was Federal and Blazer. After burning up my supply of once fired and having no issues with brass I've since tried a different tactic.
I've gone to my pail of brass and sorted out Fed, Blazer, Speer, Win, Starline and RP. I save the once fired for major matches. No problems so far.