.338 Marlin Express Load Data

Caliber Overview

The .338 Marlin Express is a relatively recent addition to the world of centerfire rifle cartridges, developed to bridge the gap between traditional lever-action power and modern performance. Introduced in 2009 through collaboration between Hornady Manufacturing and Marlin Firearms, the .338 Marlin Express was designed specifically for Marlin's Model 336 and Model 338MX lever-action rifles. Inspired by the success of the .308 Marlin Express, its development focused on delivering magnum-level ballistics in a round-nosed projectile that could function safely in tubular magazines, a necessary feature for lever actions. Utilizing modern powder technology and Hornady’s innovative Flex Tip (FTX) bullet design, the round allows for superior external ballistics compared to classic lever-action cartridges like the .30-30 Winchester, while maintaining safe operation in tubular magazines.

For reloaders and hunters, the .338 Marlin Express offers a compelling balance of power and manageable recoil, making it a versatile choice for a variety of hunting applications. Its high muzzle velocities—often approaching those of the .338 Federal—combined with improved downrange energy retention, deliver exceptional terminal ballistics at medium to extended ranges. The cartridge’s design maximizes the effectiveness of lever-action rifles and extends their practical hunting range, making it ideal for scenarios where heavy cover or rapid follow-up shots are necessary. Whether you’re in dense woodlands after whitetail or in more open terrain pursuing elk, the .338 Marlin Express brings flexibility and reliability to the field.

When it comes to target species, the .338 Marlin Express is well-suited for a variety of North American big game. Its power and energy are more than adequate for deer, black bear, and wild hogs, and it also has enough punch for larger game such as moose or elk at moderate distances. The carefully engineered bullet profile ensures reliable expansion and deep penetration, which are crucial for ethical kills on tough animals. For reloaders who wish to tailor performance, this cartridge allows careful selection of bullet weights and profiles to optimize for specific game or hunting conditions.

Typical bullet weights for the .338 Marlin Express range from 180 to 200 grains, with most factory and recommended reloading options favoring the 200-grain FTX bullet. This weight, paired with its unique polymer tip, provides a high ballistic coefficient compared to most other lever gun-friendly bullets, thus enabling flatter trajectories and better energy retention at distance. Standard muzzle velocities hover around 2,565 to 2,650 feet per second with factory loads, providing more than 3,000 foot-pounds of muzzle energy—positioning the cartridge as a high-performance option for lever-action fans. The case design, which is based on the .376 Steyr case shortened and necked down, also allows for smooth feeding, strong headspacing, and reliable extraction. For reloaders, brass and component bullets are readily available, and the unique blend of modern ballistics with timeless lever-action reliability makes the .338 Marlin Express an appealing choice for those looking to diversify their big game capabilities.