According to The Hollywood Reporter, Costner’s $100 million movie (a sum prior to marketing costs) is set to open at $12 million domestically on the June 28-30 weekend.

The Western, set around the American Civil War, is going up against A Quiet Place: Day One, which is due to take as much as $40 million.

Meanwhile the outlet reports: “Insiders say Costner believes that tracking isn’t capturing his fan base, which largely resides in the middle of the country.”

On top of that, sources…