Joe you may not like to put a gun away dirty, but I strongly suggest that you not go hunting with a clean barrel, or least one with any oil in it, as it may shoot off by several inches at 100 yards. I have observed this numerous times and always fire a fouler shot before judging where my rifle is shooting.
Sometimes you get lucky. I am leaving for a moose hunt in Canada tomorrow and I am taking two rifles with me. I fired one shot from each of them and to my amazement they each shot to the exact spot they were supposed to even though they may have had some oil in the barrel. Does this disprove my statement in the previous paragraph. Not on you life!