Carry a canteen with water fer drinkin and swabbin bore, spit patch when hunting, and carry a tin of beeswax in my bag. As for WD40, great for lawn mower cables, but not in my rifles. Good scrubbing with homemade solvent and after drying bore with patches I spray with rem oil or 3 in one oil if I have it. Heard all kind of reprimands on petroleum based lubes for the bore, inmho, I see no harm. And my barrels don't rust in storage. Then too, my rifles all get dry swabbed and reoiled every two mos. tops. I worry more about rust and pits than I do about some supposed malignant petroleum build up in the bore. Shoot me if I'm wrong.