Andy, it is my belief that Rio hulls are made by Cheddite, look at the head stamp. I have bought them and cut them down (to 2 1/2") when I could find no others, couldn't tell the difference when loading. As a teenager just starting to reload shot shells I shot up pounds of Unique in a 20 ga. 870. Check manufacturer data looking for sub 1200 FPS loads, Alliant website has several low velocity loads showing unique and Orange Duster wads with light shot weights. As the hulls may be different, back well off the max load and pay close attention for pressure signs. It is generally NOT RECOMMENDED TO SUBSTITUTE ANYTHING IN A PUBLISHED LOAD but I use several loads that started with non published component combinations to this day.
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