I've had very good results using CCI BR-2 primers for ammunition for my "serious" rifles. No results to report on 6.5CM, though. The new Nosler reloading guide #8 wants Federal 210's for primers in 6.5CM.
I do not use Federal primers when there is any alternative, simply because of their space-wasting and difficult-to-get-onto-a-primer-tray packaging. (And I don't care what excuse is used, either--please don't lets argue about that.)