Whoops, I missed the part about it being .308.
Dark Angel is, I believe, correct.
The TWO 7 is actually the military headstamp, and is correctly read as
TW
and 70
TW is Twin Cities Ordnance Plant, and 70 is 1970, the year the round was originally manufactured.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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