This is 5.56x45 M855 ammo – that means its bullet is magnetic, but not for cost-saving purposes. The 62 grain FMJ has a steel “penetrator core” – lead in back and steel in front, which enables it to dominate barriers at close to medium range. The bullet can pierce a 1/8” thick sheet of steel at 2,000 feet! And though the M855 bullet doesn’t fragment like a more conventional FMJ, it does still present a significant chance of breaking in half inside its target.
This ammo’s brass cases have plainly visible annealing marks. These are a remnant of the heat treatment process which made the brass more robust; the cases are in fact brand new and not reloaded.
The heavier M855 bullet provides the best accuracy when fired out of a 1:9 or 1:8 twist barrel.
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