Fed209A is a mag primer and should work but i had minor issues with mag primers and FPJs.....They leaked more
Win ML primers are a no go for sure....much too weak to ignite BH209 in a FPJ and not recommended at all actually
Standard CCI209s should work fine
Mag CCI209s are about the same as a Fed209A
CCI MLZ primers are also too weak.
I had the best luck with regular Win209s and Rem STS primer in the FPJs....Not the Rem ML primers. Now with that out of the way, i dont like the FPJs with BH209 BUT Knight does sell a "vented" FPJ plug that is supposed to be more reliable with BH209. I have never used it. All of mine are original Lehigh plugs and 1 is a Bestill bushing plug. They are 100% reliable as long as they don't leak super bad which they shouldn't.
If there are anymore Lehigh plugs around you will need to buy some vent liners for them. The guy who had them did not include vent liners and wanted about $40 for the plug and adapter. Vent liners sell for between $3-$6 each and last many many shots unless you shoot some really hotrod loads.
Send an email to this address and check. It was the last known source of Lehigh plugs and email@example.com