IF the Breech plug is set up right and properly seals the Primer from blow back, Mag primers are not needed, but some like them, no issue with that. I have used a lot of Win 209s and Rem STS and never had an issue even when it was cold.
My question was not really about IF it will ignite BH, Just IF the Fiocci is close in heat range to a Win 209, cooler or hotter.
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