Proof enough. You don’t know enough to comment on the subject. Smart asses are a dime a dozen.
Now that I'm done giving you trouble.
Could be your firing pin broke off a piece just big enough to make a difference. Could be your spring was a career contortionist. Could be the spring wasn't the highest quality, and that the cold affected it's decompression. This is why we ask for pictures of the affected areas.
Petersen's manual refers to a few possibilities. When it comes to these types of malfunctions:
1. The firing pin protrusion/length: Simply not going far enough to pop the primer for X,Y or Z. Plausibe.
2. The spring: The spring isn't providing enough force to pop the primer. The manual says that the spring may be binding on itself in such a way that there are frictional forces strong enough to either slow the firing pin down or stop it dead in it's tracks. Plausible.
3. Wear and Tear: in this case , it states that it's possible that the use of the rifle may have worn components out to the point of failure. Unlikely.
4. The Firing Pin is not centered: the firing pin isn't striking the primer, for some reason. Unlikely.
However, it seems you've fixed it. And if that's the case, you made it a reliable hunting rifle, great job. I give you mad props for that.
And dude, I feel you when it comes to laziness. We all have those fays. Folks here really want to help, but it's hard when you give us nothing to work with.