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I was using my AR 762x39 for sub-sonic hog hunting before I built my 300 and then got into 458 Socom sub-sonic. The 762x39 barrel is 16" with a 1-10 twist and Horn .308-220gr RN with 9 1/2gr Win 296 and went around 1050fps and 2"groups @ 100yds through a YHM 762 SS QD. Also Speer 200gr SP with 9 1/2 Win 296 and went around 1050 and group well. It has been a while back, but I post reports with picks of pig to show damage. The boat tail match bullets will likely not stabalize with your twist, so shoot paper before you put your can on.
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