Many of us just don't get enough opportunity to hunt and have to hunt whenever we can, weather or not. I've had some very fun hunts in truly crappy weather; some were productive of game bagged and/or other wildlife seen, some just fun to listen to one or more of my companions whine creatively. And DOGS always have a good time, irrespective of weather, which adds to MY enjoyment.

I do have designated rain guns that I use instead of my elderly American doubles (most of which are just elderly, not especially notable except for sentimental value). The main ones I use are Ruger Red Labels, a 12 and a 28, which are partly stainless and pretty easy to maintain. Now that I live in "the land of little rain" (VERY little this year), I don't have much need of them.

When I lived in the Frozen North (WI, ID, WA, VT, and upstate NYS), I worried more about keeping myself safe from weather than my gun, tho. Have had frostbite and also fallen thru ice into a deep stream. Makes you kinda put mere rust in perspective.