The .300 Remington Ultra Magnum (RUM) is a high-powered, long-range rifle cartridge developed by Remington Arms Company in 1999. It is part of Remington's Ultra Magnum series and is based on the .404 Jeffery case, which has been necked down to accept .30 caliber (7.62 mm) bullets.
Characteristics:
- Bullet Diameter: .308 inches (7.82 mm)
- Case Length: 2.850 inches (72.39 mm)
- Overall Length: 3.600 inches (91.44 mm)
- Maximum Pressure: ~65,000 psi
The .300 RUM is renowned for its high velocity and flat trajectory, making it suitable for large game hunting and long-distance shooting. It delivers superior performance compared to the more common .300 Winchester Magnum, with the capability to shoot heavier bullets at higher velocities. This power and range come with drawbacks, including increased recoil and barrel wear.
It's often used by hunters targeting large and potentially dangerous game such as elk, moose, and bear, as well as precision shooters needing extended reach and stopping power.