With multiple shooters do they have to keep switching their shoot cards in the SLU when it’s their turn to shoot?
No. As each shoot card is inserted into the SLU, its content is “emptied” into the SLU memory. Each shoot card has a unique “storage area” inside the SLU. As targets are released a “running total” is kept until shooting finishes. At that time the target usage is divided between the number of shooters, and their “storage areas” are adjusted. As each shooter inserts his shoot card into the SLU, to leave the station, his shoot card is updated from his “storage area” in the SLU.