Understanding the 400 Legend bullet diameter is essential for anyone considering this cartridge for hunting or target shooting. The .400 Legend, often abbreviated as .400 LGND, is a relatively new centerfire cartridge designed specifically for lever-action rifles. Its popularity stems from a combination of manageable recoil, suitable terminal performance, and compatibility with standard-length actions. However, the specific dimensions, particularly the bullet diameter, are critical for ensuring proper fit, function, and accuracy within a given firearm.
Defining the 400 Legend Bullet Diameter
The nominal 400 Legend bullet diameter is .400 inches, which translates to 10.16mm. This specification aligns with other popular cartridges like the .40 S&W and the 400 Cor-Bon, creating a familiar platform for reloading enthusiasts and shooters transitioning between different firearms. Industry standards dictate that bullet manufacturers produce projectiles in this size to match the groove diameter of the 400 Legend barrel. While the designation suggests a perfect .400-inch ball, slight variations in manufacturing tolerances exist, but they remain within acceptable parameters for reliable feeding and chambering.
Comparison to Similar Cartridges
When comparing the 400 Legend to its main competitor, the .450 Bushmaster, the difference in bullet diameter becomes apparent. The .450 Bushmaster utilizes a larger .452-inch bullet, offering greater frontal diameter and potentially more stopping power on large game. In contrast, the 400 Legend’s smaller .400-inch projectile is engineered for velocity and trajectory, maintaining supersonic speeds past 200 yards. This fundamental dimensional distinction dictates the primary applications for each cartridge, with the 400 Legend favoring varmint and medium-game hunting where flatter sight lines are advantageous.
Importance of Precision in Bore Sizing
Manufacturers like Winchester and Hornady produce bullets specifically for the 400 Legend that adhere closely to the .400-inch standard. The accuracy of this diameter directly impacts the gas seal and rifling engagement within the barrel. A bullet that is too small will lead to poor accuracy and excessive copper fouling, while a bullet that is too large will prevent the cartridge from chambering entirely or cause dangerous pressure spikes. Consequently, reloading manuals and component specifications emphasize the importance of using the correct die and sizing lubricant to achieve the optimal fit for this specific bullet diameter.
Terminal Ballistics and Performance Factors
While diameter is a key identifier, the 400 Legend’s effectiveness is also a result of its design philosophy. The .400-inch bullet is typically paired with a weight ranging from 165 to 220 grains. This combination allows for efficient expansion upon impact, transferring energy effectively to the target. The trajectory benefits of the smaller diameter bullet allow for more precise shot placement on medium-sized game like deer and feral hogs at moderate distances. Shooters appreciate that the recoil generated by this configuration remains mild, promoting faster follow-up shots and better overall accuracy in the field.
Reloading Considerations and Specifications
For the handloader, verifying the 400 Legend bullet diameter is a fundamental step in the process. Casings are trimmed to length, resized, and then prepared to accept a bullet of the exact specified size. Loading data charts provided by powder manufacturers explicitly list the correct bullet diameter for safe and effective reloading. Ignoring these specifications can result in catastrophic firearm failure, making attention to detail non-negotiable. The availability of brass and components specifically marketed for the 400 Legend ensures that reloaders can maintain the correct dimensional integrity of their ammunition.
