I don't think it's the primer alone but the primer powder combo causing your problems.
I wouldn't trash the wolf primers just yet, they are probably fine for another application.
What kind of load density are you getting with the N550? I suspect a load density problem especially if you're near start with your loadings.
I also suspect if you try the same charge of N550 with the br4s you may have the same problem.
From my experience with hang fires I really don't think it's a rifle problem but a load problem
Here's an article you may or may not have seen on some load work up for the 6.5x47.
http://www.accurateshooter.com/guns-of-week/gunweek072/
Good Luck and be careful.