Primer brands differ little. Unlike with shot shells, when loading rifle ammo you can substitute any primer of the same type. (large rifle for large rifle) Then of course rework your load when changing components even though I have seen no difference when going from a CCI large rifle to a Win large rifle primer.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.)