I could not extract the shells of the Hornady 195 gr BTHP Match .300 Win Mag, even though they chambered smoothly. Even banging on the bolt handle with a baseball bat sized piece of wood at the shooting range did not work. I had to use a large rubber mallet back at home to get the shell out.
Holy crap! You are one lucky shooter. I would NEVER bang on a Remington bolt handle. They are silver soldered on and will break off very easily when struck. Many have already done this. That's why there are smiths/businesses, at least here in the U.S., that TIG weld the handles to the bolt body. Safest way for a fired stuck round is a cleaning rod down the bore and hit it with a mallet while the bolt is open.