My BIL and I disagree on this. You SHOULD be able to run a dry patch through several times before hunting to get the oil residue out. In my experience, you still won't get all of the residue out, and your first shot may or may not be off. IMHO, you are better off shooting a fouler shot and leaving that way through the hunt or season. I have done that with the same rifles for the last twelve years without any adverse effect. At the end of the season, the rifles get a thorough cleaning before storage.My platoon training officerin Infantry Officer Basic passed that on to me in 1979, the night before a rifle qualification (I always shotExpert)and I never forgot that lesson.