if you clean you rifle appropriately and regularly you won't have to worry about rust.
What do you consider appropriately and regularly?I have been on ten day hunts where it rained every day.With my stainless rifles I gave them a quick wipe down at the end of every day whereas the hunters using blued rifles either spent a great deal of time cleaning and oiling ,or their rifles developed rust very quickly.The last thing that a person needs to do at the end of a long day of hunting is to have to spend a lot of time trying to rid his rifle rifle of all traces of moisture when his only shelter is a tent.