rifle was shooting normally
this round fed normally, pulled trigger, click, no bang, some dark smoke coing out of chamber area, released mag and waited 30 seconds. extracted round normally....

what was wrong with this round?

It looks like you may have had a round without the flash hole for the primer.

I had the exact same thing happen with some Wolf.  Just once.  No big deal.

Either no primer hole or the primer was seated sideways. It may have been seated just right so the firing pin ignited the primer compound, but the off side of the primer cup prevented any flame from reaching the main charge.  Probably a good thing, too.

I have seen several occurances of primers not properly seated on factory loads, but not very many cases without flash holes. Most fail to even ignite the primer compound as it is reduced to a powder during the seating process and falls out.

Pull the bullet, dump the powder and look inside with a light to see if there is a flash hole. That way, you will know one way or the other.  Please don't pull a "Gomer" and try to pry the primer out!  

If you just have to do that, make sure you saturate the primer with WD-40 or a petroleum based penetrant and WAIT!

It looks like the primer is sideways.  The focus is bad, but you can see dark on either side, which really looks like it's in there sideways.