Good eye, Jeff.
The rifle is a master guide co-pilot take down in .457 Mag. It is a joy to shoot and carry.
to solve the condinsation problem, most folks up here leave their rifles in their arctic entries. An arctic entry is sort of a mud room attached to the front of the house. It is a place to get out of the wind, and is used for storage of freezers, shoes, coats, and of firearms. They are often not heated, and allows for the firearms to be at a constant temp.
your are right, it is not good to cover the bore for long term storage. In fact, for many reasons, it's best to store a long gun muzzle down.
Daniel