Johnny Lujack has the most passing yards + passing yards for the Bears in a game, with 936 against the Chicago Cardinals on December 11, 1949.

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

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