Quick Answer
.450 Bushmaster magazines typically require modifications to accommodate the rifle's straight wall cartridge case, including widening the magazine's feeding lips and possibly replacing the magazine spring, depending on the specific design and manufacturer.
Magazine Modification Requirements
When modifying .450 Bushmaster magazines, it’s essential to consider the rifle’s operating characteristics and the cartridge’s dimensions. The straight wall case of the .450 Bushmaster can cause magazine-related feeding issues if not properly addressed. Widening the magazine’s feeding lips by about 0.030-0.040 inches (0.76-1.02 mm) can help ensure reliable feeding and extraction.
Magazine Spring Replacement (If Necessary)
In some cases, the magazine spring may also require replacement to accommodate the modified feeding lips. A heavier spring with a higher spring rate (around 18-20 pounds per inch or 3.17-3.49 kg/m) can help to properly seat and extract the straight wall cartridge case from the magazine. However, this should only be done if the original spring is found to be inadequate for the modified magazine, as excessive spring tension can lead to reliability issues and potential damage to the rifle’s action.
Magazine Compatibility Considerations
When selecting a magazine for a .450 Bushmaster rifle, it’s crucial to choose a design that is specifically optimized for the straight wall cartridge case. Look for magazines with wide, reinforced feeding lips and a sturdy spring design. Additionally, some manufacturers may offer magazines with a proprietary design or modifications specifically intended for the .450 Bushmaster. In such cases, it’s essential to follow the manufacturer’s guidelines for installation and use to ensure optimal performance and reliability.
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