I'm just wondering, why wouldn't one want to clean between each shot regardless of how dirty the powder is? I can understand if you're at the range just to feel the recoil and see the pretty smoke, but if you're shooting for accuracy or sighting in, wouldn't you want each shot to leave a barrel that's as clean as possible?

When I go to the range I pay particular attention to the very first shot of the day. That's because when I'm out hunting, that's the shot I'm going to take. It's the one that's going to be leaving a gun that was just cleaned the night before, which means zero crud and zero dirt. That's why when I'm on the range I clean religiously, swabbing until it's perfect. I even take the breech plug out and clean that. I want each succeeding shot to be fired under the same exact conditions as the first one. I know you can't get every little speck of dirt out in the field, but I try my best.