I would think with the kind of break design of the Wolf and the 209 primer ignition you would not have too much of a problem on that end. Maybe some simple handi wrap placed over the break of the breech. This should track water away from the opening.

As for the muzzle the same handi wrap or cling wrap as it is called (they actually have some out on the market they claim will seal to anything and stick.. sounds perfect for wrapping the muzzle of a rifle) put over the end of the barrel and held on with a small rubber band should seal that. They also sell finger cots at Wal Mart (get the extra large size) that are like a balloon only thinner and will slip over the end. They come with their own elastic per say...

How many of you ever go and spend a day on the range in a snow or rain storm just to see how the rifle does react? It will give you a lot of confidence in your rifle. Of course on the range you are shooting right away instead of sitting all afternoon.