Factory brass is factory brass, it will need to be prepped properly.
Generally speaking........neck thickness is the weakest part of the WSSM case. Turn the necks to a decent thickness and cut the chamber with the appropriate reamer and it'll be as good a case as most others that have been properly prepped.
The 6.5WSSM when done properly shoots excellent I have read. It should apply to any WSSM.
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