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I hate the idea of switching 209 primers as there is almost always a variation in pressure from one brand to the next when you look at the data from the powder manufacturers. Winchester 209 tend to be "hotter" than Rem 209's.
I looked on the Alliant website and they only list the Fed 209 data with Steel powder. Best advice would be to e-mail or call Alliant and ask about the substitution.
That said, I have found that Cheddite 209 primers most closely replicate Remington 209's in trap loads.
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