For whatever it's worth I have hunted big game here in Arizona* in day after day of rain/sleet/snow with wood stocked Ruger 77s without any problems whatsoever. All of my hunting guns are given a generous coat of Flitz's Gun Polish and of course properly maintained after the hunt. I have never had a problem with rust or anything else and they still look great.
*Yes it does rain and snow here particularly during the late hunting season.
Jim

The 2nd Amendment IS an unalienable right.