There were Alcan plastic wads available back in the day. The 1970s era reloading manuals have loads for the AL powders using Alcan plastic wads. I talked to someone recently that had Alcan wads lying around but when I offered to buy them his asking price was about 5 times what the Alcan wads cost back in the day + shipping. My guess is they were so old as to be brittle and would be like wrapping shot in cut up tin cans.
Using current loading data, I agree with Paul Harm in adjusting the Alcan powder charge downward with today's wads.
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