Ian, there is absolutely no difference between being "swept" by a closed shotgun that is empty, loaded, or safety on or safety off. It is all the same, and these guys are giving you the straight information. There is no need or use for a safety on the clay target field. Those who choose to manipulate their safeties are watched like hawks by their fellow shooters because they are obviously inexperienced or have been instructed by someone not familiar with clay target protocol.