sentences:  The .300 RUM features a rebated rim much like the .300 Canadian Magnum so as to allow the cartridge to function in the Remington M700 action without having to increase the bolt and bolt face diameter of the action.Unlike the belted Magnum cases based on the .375 H&H Magnum cartridge, the .300 RUM does not have a belt.All things being equal, a beltless cartridge would feed more reliably and more smoothly than a belted cartridge.