Marc, as some posters say, there should be no bad results from using plastic wad loading data to load with card and fiber wads except a nominal lowering of pressure levels. Make sure your card wad is a good tight fit in your shell or you will get some blowby. A plastic shell may be a little big for common card wads of the same gauge. Circle Fly Wads in Pennsylvania will sell you larger card wads if yours are too small for your plastic shells. They may also give you some loading information.
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