The .338 Remington Ultra Magnum (RUM) is a high-performance rifle cartridge designed by Remington. Introduced in the late 1990s, it is part of the Ultra Magnum line of cartridges, known for their large case capacities that allow for higher velocities and greater energy delivery. The .338 RUM is built on a modified .404 Jeffery case, which is necked down to accept a .338-inch (8.6mm) diameter bullet.
This cartridge is generally used for long-range big game hunting, particularly in North America and Africa. It is capable of taking down large, tough game such as elk, moose, and bear due to its impressive ballistic performance and kinetic energy. Hunters appreciate its flat trajectory, making it suitable for long-distance shots in wide-open terrains.
Popular bullet weights for the .338 RUM range from 200 to 300 grains, offering versatility for different types of hunting scenarios. Some known drawbacks include significant recoil and ammunition cost, which can be considerable due to its size and power.
Overall, the .338 Remington Ultra Magnum is favored by hunters needing long-range precision and substantial stopping power for large game.