the ar15 started life with a 1/14 twist but was quickly changed to 1/12 when it wouldn't stabilize a 55 grain bullet in COLD weather. The 1/14 did create a spectacular wound channel though
I had an old 1/14 barrel on an old AR in high school. I didn't know it at the time but I was curious at the fantastic damage that little round caused on medium game animals.
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