Quick Answer
Velocity differences between .458 SOCOM loads can range from 1,000 to 1,500 feet per second, largely dependent on the type of propellant, bullet weight, and overall rifle configuration.
Bullet Weight and Velocity
When selecting a .458 SOCOM load, bullet weight plays a significant role in determining velocity. Lighter bullets, typically weighing 300-400 grains, can reach velocities of up to 1,600 feet per second, while heavier bullets, weighing 500-550 grains, may have velocities around 1,200-1,300 feet per second. This is due to the increased kinetic energy required to propel heavier projectiles.
Propellant Types and Their Effects
The type of propellant used in .458 SOCOM loads also affects velocity. Smaller grain sizes and faster burning propellants can result in higher velocities, often up to 1,500 feet per second. Conversely, larger grain sizes and slower burning propellants may reduce velocity to around 1,000 feet per second. Examples of propellants used in .458 SOCOM loads include Hodgdon H1000, IMR 8133, and Reloder 33.
Rifle Configuration and Velocity
The overall rifle configuration, including barrel length and choke, can also impact .458 SOCOM velocity. Shorter barrel lengths, typically 12-14 inches, may reduce velocity due to increased pressure and gas blowback. Conversely, longer barrel lengths, often 24-30 inches, can result in higher velocities, up to 1,600 feet per second, due to increased bullet acceleration.
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