was it very cold outside ???
The ammo could of been on markdown because it might of been kept in a not climate controlled environment, causing the primers and powder to absorb moisture (hence why military cartridges are sealed).
The moisture content and cold weather would of added to some of them not wanting to fire.
Never had any FTF's with factory ammo if the rifle was working 100%. Only FTF I've had was with a badly maintained SKS and Barnaul ammo, and a weak firing pin spring on a bolt gun failed to strike the primer hard enough.
You say the firing pin strikes look normal, so I assume the rifle's firing pin spring is good. This leaves the ammo to be questionable and maybe why it was on sale, but I don't know how you can verify such a thing.
I've bought lots of factory ammo that was on huge discount and haven't had any problems.
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