Certainly helpful.

In this case there's a Recknagel trigger in the rifle, though I have also switched to the original military trigger on most of my Mausers because they are so efficient and when tuned, superior. I am finding I increasingly dislike the 'breaks like glass' feel of single stage triggers. Timneys especially I find have a 60 grit internal finish.

I do use ATF on my rifles. What I think happened with this rifle is condensation formed then froze on the cocking piece or in the trigger. It's rarely humid here but this day was both cold and humid. I switched to another rifle for the really cold days.