.458 HAMR AMMO
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The 458 HAMR case is longer than the 458 SOCOM case. During normal chambering, the HAMR will not fit in a 458 SOCOM rifle. You tried to chamber the same HAMR cartridge repeatedly in a .458 SOCOM. The case shoulder could potentially set back the .040 that would allow chambering, thereby creating an overpressure situation that would most likely damage your .458 SOCOM rifle and potentially cause injury.
The .458 HAM'R is a .458 SOCOM based caliber that was designed by Bill Wilson to push a 300-grain projectile 200fps faster than the SOCOM. Due to limitations of the bolt and extension of the AR-15, the .458 HAM'R chambered in a hybrid AR platform that utilizes a more massive diameter bolt and extension.
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