They peaked when the Finns captured them and were finished with them. Otherwise, yes, they peaked at the factory.
I hear so many stories about 91/30's, the worst being having to beat the bolt open with a section of 2x4 after every shot, most likely because they are using cheap, steel cased and heavily coated shells that melt and stick. If I was only allowed to keep one Mosin Nagant, it would be my Finn 38. I also have a Finn 91/30 that probably had little done except a replaced front sight and a bit of trigger work. Previous owner claimed sticky bolt which was most likely shellacked shell casings because I haven't had an issue with it.