For the hunter weighing options for the AR-15 platform in North America, the comparison between the 450 Bushmaster and 400 Legend is one of the most practical discussions available. Both cartridges were designed to bring the versatility of the AR-15 to large game hunting, filling the gap between traditional bolt-action setups and smaller varmint rounds. Understanding the nuanced differences between these two powerful cartridges is essential for making an informed decision that aligns with specific hunting scenarios and performance expectations.
Ballistics and Terminal Performance
When comparing terminal ballistics, the 450 Bushmaster holds a distinct advantage due to its larger diameter bullet, which is typically .452 inches. This size creates a wider permanent wound channel, transferring energy more aggressively to the target and creating a larger exit wound. The 400 Legend, firing a .40 caliber projectile, is still highly effective but follows a more traditional path similar to other bottleneck cartridges, often requiring more precise shot placement to achieve the same immediate stopping power.
Energy and Trajectory
In terms of raw energy, the 450 Bushmaster generally outperforms the 400 Legend, especially at the closer to mid-range distances where hunters typically operate. A standard 250-grain load from the 450 Bushmaster can deliver energy levels exceeding 2,000 foot-pounds, making it suitable for species like deer and black bear. The 400 Legend, while slightly faster due to its lighter bullets, usually sits in the 1,400 to 1,600 foot-pound range, which is still ample for deer but less formidable for larger game at the edge of its effective range.
Platform Compatibility and Functionality
One of the most significant factors in the 450 Bushmaster vs 400 Legend debate is how they integrate with the AR-15 platform. The 450 Bushmaster requires a specific bolt face and often a modified magazine because of its large, straight-walled case. This means that rifles chambered in this caliber usually have dedicated components, whereas a rifle switched to 400 Legend can often share magazines with other 5.56-chambered rifles, offering a degree of modularity that is highly valued by competitive shooters or those with multiple rifles.
Magazine Capacity and Handling
Handling characteristics differ significantly between the two. The 450 Bushmaster typically utilizes a single-stack magazine that holds only five rounds in many states due to magazine capacity restrictions for big game hunting. This contrasts with the 400 Legend, which can often utilize standard AR-15 magazines holding ten rounds or more, depending on local laws. For hunters who value the ability to carry more ammunition without swapping mags, the 400 Legend provides a distinct logistical advantage.
Barrel and Recoil Considerations
Barrel length plays a crucial role in getting the best performance from either cartridge. The 450 Bushmaster requires a barrel length of at least 16 inches to allow the powder to burn efficiently and reach its optimal velocity. The 400 Legend is more flexible and can be cycled effectively in a pistol configuration with a shorter barrel, though it performs best in a rifle. Regarding recoil, the 450 Bushmaster generates a stout push that some shooters find sharp, while the 400 Legend is generally regarded as more manageable, allowing for faster follow-up shots.
Ammunition Availability and Cost
Long-term ownership costs and availability are critical considerations for the practical hunter. The 400 Legend has seen a surge in popularity, leading to a wide variety of ammunition options from many manufacturers, often at a lower price point due to the size of the brass case. The 450 Bushmaster, being a newer and more specialized cartridge, tends to be more expensive and can sometimes be harder to find on store shelves, though its performance in the field is unmatched for specific applications.
