Don't know where you live Thunder, but here in Kentucky, we get pretty humid weather 10 months of the year. For me that means lightly oiling the bore of those guns, (rifle, shotgun, or handguns), that I'm currently using on a regular basis...and "currently", means every couple of days. Before using, I wipe the bore out with a clean patch, soaked in alcohol. That minimizes the impact shift away from your fouled zero to some extent. It's important when working up loads in a rifle and you're shooting groups.
But for hunting in inclement weather, I leave a thin coat of Hoppe's in the bore, (after wiping the chamber clean and dry in rifle or revolver). In my experimentation, the thin coat of Hoppe's in the bore of a hunting rifle moves the impact point of the first round fired by less than 1" at 100 yds...using this technique. The damp bore will not rust when so treated. On return to camp, I clean and oil the bore as normal.
A clean dry chamber is usually recommended for rifles and revolvers just prior to shooting. If a coating of oil remains, the cartridge case "sets back" against the bolt face in a rifle, or the recoil shield/firing pin hole in a revolver, increasing pressures. Too, in a rifle, an oily chamber raises chamber pressures by taking up some of the space that a fired cartridge uses in expansion. In the '30's at Camp Perry, shooters would "grease" their bullets in an attempt to reduce the fouling caused by the jacket materials and primer compounds then in use. The grease of course migrated down over the cartridge necks during recoil from previous rounds, and chamber pressures sky-rocketed. An oily chamber and neck has the same effect to some extent.
The Service Teams, Marines for sure and the others I suspect, leave a thin coating of Hoppe's or something similar, in their bores overnight at Camp Perry, with no worries about impact shifts the next morning. They do wipe the bores dry prior to competing....I take my advice from them...this was true in '06 and '07; the last time I shot at Perry and I did ask about their cleaning practices at the time.
Long term storage is another kettle of fish. For real long term...years...a coating of grease liberally applied to the bore is required for complete confidence. For shorter term, I use CLP, Breakfree, or Ed's Red with never a problem. Again...I wipe it out prior to shooting...or leave a thin coating of Hoppe's in the bore alone, when hunting in inclement weather.
HTHs Rodfac