Part Number: 304W This brass washer is placed on top of the powders charge bar.Its keeps powders like W296 from leaking from between the bar & measure. If damaged/flattened, this washer can move with the bar. This can cause powder not to drop correctly, resulting in a light powder charger/wad stuck in the barrel. Set the wad seating ram to show a tiny amount of wad pressure on seating. This will show you if there is enough powder in the case.