Design History and Cartridge Performance
Whereas the .308 Marlin Express began by modifying the .307 Winchester, Hornady and Marlin engineers started with a previous collaboration between Hornady and the Austrian arms maker Steyr, the .376 Steyr, when designing the .338 Marlin Express. The case of the .376 Steyr was given a thicker web for added strength, then necked down to .338. The .308 Marlin Express, on the other hand, was made with a thinner web than its parent case, the .307 Winchester, for additional capacity. Although the thicker case webbing reduced capacity, new powders allow the .338 Marlin Express to achieve velocities similar to the .338 Federal with significantly lower pressures. Hornady engineers then looked to the projectile for the new cartridge. They settled on the 200-grain .338 projectile from their .338 Winchester Magnum line. The existing bullet was remade with a thinner jacket in order to promote expansion and upset at longer ranges. This 200-grain .338" projectile is able to impart significantly more energy than the 160 gr projectile used in the .308 Marlin Express, despite similar muzzle velocities. Further, the projectile's high ballistic coefficient allows the .338 Marlin Express to maintain velocity to greater distances than big bore lever cartridges such as .45-70, .444 Marlin, or even the high performance .450 Marlin. Although the heavy bullet weight of these cartridges allow them more muzzle energy, the ballistic advantage of the .338 Marlin Express's projectile begins to show beyond 100 yds. After that point the .338 Marlin Express's projectile retains more energy than even the .450 Marlin. Like the .308 Marlin Express, the .338 Marlin Express was designed to be a relatively flat shooting cartridge, taking advantage of the relatively high Bc bullets Hornady designed for the rounds. Its trajectory is similar to the .30-06 Springfield.
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