.338 RCM Load Data

Introduced in 2008 by Hornady in partnership with Ruger, the .338 Ruger Compact Magnum (RCM) was designed to provide magnum-level performance in a compact, short-action rifle. The idea was to offer hunters and shooters a cartridge with the ballistic capabilities of longer magnum rounds such as the .338 Winchester Magnum, but in a more compact package suited for lightweight mountain rifles. The parent case for the .338 RCM is based on the .375 Ruger, itself a rimless .30-06 length magnum case, necked down to accept .338 caliber projectiles. While the .338 RCM and its sibling, the .300 RCM, were innovative, both remain somewhat niche cartridges, largely enjoyed by a dedicated subset of hunters and reloaders who value efficient, powerful compact cartridges.

The primary application of the .338 RCM is big game hunting, especially in scenarios where weight and maneuverability of the rifle are priorities, such as mountain hunting or when traversing thickly wooded terrain. The .338 RCM delivers magnum-class velocities with impressive energy retention, making it suitable for a wide range of North American and international game. Due to its efficient case design and ability to be chambered in short-action rifles, the .338 RCM is favored by hunters who want powerful terminal ballistics without carrying a long, heavy magnum rifle. While it never achieved mainstream popularity, its performance profile and manageable recoil have kept it relevant, especially with seasoned handloaders and those who prefer custom or semi-custom rifles.

In terms of target species, the .338 RCM is credentialed for medium to large game animals. Elk, moose, caribou, and black bear are staple pursuits for this caliber, and it offers enough power for confident shots at ethical distances. In North America, it is often considered an all-around hunting cartridge for those who may encounter species as small as deer or as large as grizzly bear. Its flat trajectory and potent energy also make it viable for some African plains game species, though its global availability might limit its use abroad. Careful bullet selection and load development can further tailor its performance to specific game animals or hunting scenarios.

Reloaders will find the .338 RCM accepts a broad array of .338 caliber bullets, with typical bullet weights ranging from 180 to 250 grains. The most popular projectiles generally fall between 200 and 225 grains for optimal balance of velocity, trajectory, and terminal performance. Heavier bullets in the 225–250 grain range are usually reserved for large-bodied game or situations demanding maximum penetration, while lighter bullets offer flatter trajectories and higher velocities for deer-sized animals. The .338 RCM’s short, fat case design leads to efficient powder burns and consistent velocities, making it a solid platform for precision-minded handloaders. Additionally, modern powders and premium bullets can push the performance envelope, ensuring the .338 RCM remains a relevant choice among those who value high performance from a compact magnum cartridge.