.338 Rem. Ultra Mag. Load Data & Reloading Guide

The .338 Remington Ultra Mag, introduced in 1999, is a powerful belted magnum cartridge designed for long-range precision shooting and big game hunting. It was developed to meet the needs of hunters and shooters who demand a high-velocity, hard-hitting round capable of delivering significant energy at extended distances. The .338 Ultra Mag has quickly gained a reputation for its effectiveness in various hunting scenarios and long-range shooting competitions.

This cartridge features a case length of 2.825 inches and utilizes the standard .338 caliber bullet diameter of 0.338 inches. It can launch bullets at velocities exceeding 3,000 feet per second, depending on the projectile and powder used. The .338 Ultra Mag is typically loaded with bullet weights ranging from 200 to 300 grains, making it suitable for a wide range of game, including large North American species such as moose, elk, and bear.

In terms of ballistic performance, the .338 Rem. Ultra Mag exhibits excellent retained energy and flat trajectory, allowing for effective engagement beyond 1,000 yards. Its ability to deliver heavy bullets at high velocity results in impressive stopping power and penetration, increasing its appeal for serious big game hunters. Additionally, the cartridge’s performance characteristics make it attractive for reloaders who wish to customize load data to optimize for accuracy and terminal performance.

Reloaders appreciate the versatility offered by the .338 Ultra Mag, as it allows for experimentation with various bullet types, weights, and powder choices to achieve specific performance goals. The higher case capacity provides flexibility for handloaders, enabling tailored loads for different applications, whether for hunting or target shooting. This adaptability, combined with the .338 Rem. Ultra Mag's significant performance advantages, reinforces its desirability within the reloading community.