Ben Roethlisberger had the most passing yards + passing yards for the Steelers in a game in 2020, with 682 against the Colts on December 27.

who had the most passing + yards for the pittsburgh steelers in a+ game last season, minimum of 300+ passing + yards
Interpreted as:
Who had the most passing + passing yards for the pittsburgh steelers in a+ regular-season game last season, minimum of 300+ passing + passing yards?

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