The only people I've ever personally seen raise a concern about the Tikka's performance in cold weather are people who either have no experience with Tikkas in cold weather or who lack general cold weather experience overall. I think there's a lot of cold weather issues that get blown out of proportion by the the folk located in more tropical locations or who tend to prefer to only hunt when the weather is a little finer. I imagine this is no different than some hot weather related issues that us folk located more in the north might have exaggerated over the years. I've been using Tikkas for about a decade now in some real cold weather, with a fair bit of abuse (read, clumsiness due to cold fingers) with zero issues. I also don't know a single person in my hunting circle that would hesitate to use a Tikka for fear of cold-related issues.
No experience with CA, although I'm real tempted to try a Ridgeline.
No experience with CA, although I'm real tempted to try a Ridgeline.