Machine gun muzzle flash2/21/2023 ![]() ![]() The best overall bullet weights for these rounds seem to be in the 130 to 160 grain range. 223 velocities, they would probably “blow up” and crater on impact, as was often seen with the old 6.5mm Remington Magnum with bullet weights under 120 grains. Oddly enough, this seems to be due to their generally arriving at somewhat lower velocity than most. Sometimes, on sufficiently deep penetration, the jacket separation and core “burrowing” you saw occurs. If they hit bone, they tend to shed the bullet jacket and fragment. When they impact and penetrate, they generally begin turning end-over-end and do not restabilize, creating a wound channel reminiscent of a bayonet thrust, twist, and withdraw. ![]() The reason is apparently the bullets’ greater length-to-beam ratio compared to other typical calibers, notably the 7.62mm to 7.9mm range. This performance is typical of the 6mm and 6.5mm military rounds, be they Japanese, Greek, Swedish or whatever. ![]()
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