Ammo in cold weather

Regarding the issue with the shells not firing...

If 2 of the 4 failed in another gun, is the thought that 2 guns had light primer strike issues? Or simply the primers are harder than most, and a number of guns might have issues?
 
KEOutdoors said:
15 isnt cold enough to severely alter ammo performance in modern factory ammo. Once you get to -15 then you start having primer failures. All loads will be slow at cold temps, but you wont get a FTF at those temps.

Im guessing its a firing pin clearance issue due to metal shrinkage (or weak spring), and just was not smacking those hard Winchester primers good enough.
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Very well could be the firing pin itself, but I had zero issues with the same primers in the 2 3/4" box of super pheasant, and zero issues with the 20 or so other random loads I shot to verify operation; and 2 of the 4 rounds I tried to re-fire in a different gun did not go boom. That's why I'm leaning towards the ammo. But I'll fire off a Numrich order and replace the pin and spring to be safe.
 
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