I also own a Black Diamond XR. Humidity can be a problem but in your temperatures I do not see it being serious. The main thing is keep the rifle dry. I would be sure and swab the barrel with a pure alcohol patch and then a dry one before loading. Load as normal in the house or where ever. If you suspect it is going to be raining you might want to cover the end of the muzzle with some method to keep water from running down the barrel. There are many methods to do that. I am guessing you will be shooting the 209 primer, so you are going to get a large ignition blast to begin with. You could wrap some handi wrap around the exposed breech if it is raining but make sure you do not block the striker from working.... In fact I would practice the method you want to use to make sure the stiker slides fast and true.... When you bring the rifle into the house, be sure and store it muzzle down... That way any condensation that might build, will run out the barrel...