Hello everyone, first post here. I just picked up a 1903 made by Remington. I don't have the serial # on me right now so I'm not sure of the variant. One of the intriguing things about my purchase was that the seller had a spare barrel with it that is chambered in 300 win mag. It is also made by Remington and has a muzzle brake on it. I was never aware you could swap calibers on this weapon so readily. Do I need a different bolt for this or do I just remove and replace the barrel for caliber change? I would never assume it that easy. Thanks, for the help.