I have some RST spreader loads I used in a tightly choked 12GA. They worked well on pheasant. I believe that RST uses crossed cards inside the shot column. I didn't see that method discussed above. Is that a new approach or what? It has to be simpler than some of the ones mentioned above. I can't imagine inserting the cards can be accomplished any way except by hand, but then I've never seen commercial loaders in operation.