[short stack]

i'm looking to build some steel loads for ducks. in the lymann 5th shotshell handbook they have a recipe for a 7/8 load in a rem sts hull that uses steel powder and a rem 209p primer. the pressure runs 9100 psi. my question is: with the current primer shortage, i can't find the rem primers. i have a supply of win 209 and was wondering if anyone can help with info on swapping the two out. thanks, mark