For me it depends on the load I'm using. Some loads will shoot close enough to the samePOI clean or dirty, others shoot several inches out of the group when clean but otherwise very tight. I do swab between shots forgood consistency when shooting groups. It doesn't take long to do a quick spit patch before loading again and all you need in the field is a patch and your toungue to do it. I do, however, check each load for consistency without swabbing to see what happens if a really fast follow up shot is needed, just in case. For fouling the bore I use one of 2 methods, 1) I drop in an old Clean Shot pellet and put a patch filled sabot over it to add a little resistance, or 2) I put about 30 to 50 grains of whatever powder I'm using into the barrel and something for wadding to hold it in there. I pop a cap with the dummy load and then swab as I would at the range with a spit patch then load for the hunt. I have done this in the morning before hunting and I've done it the night before, depending on the situation. I have also left the gun loaded for up to a week of hunting and still had the load go off and perform as expected.