I do what tmitch does as well. Mine is still without any significant rust since the 80s. And I agree with him that you are fine for field cleaning or on a hunt, but you need to do the full cleaning before too long. I used to not use the oil after cleanin, but am now a believer that this is the best way to protect the bore.
Also, when you go to shoot the next time, you still have oil in the bore and you need to clean that out before you shoot. Windex on a patch works or alcohol. Run a couple of wet patches down followed by a couple of dry patches. Then pop off a few caps and swab the barrel with a dry patch, then load up.
