Hum that is unusual but every gun is different and likes different bullets. My 1in 7 opens up pretty big with 55 grainers but that being said im thinking most of the militarys barrels are 1in 7 right.
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M16 barrels are a 1:7, but not 100% sure bout the m4. It too may be a 1:7, or a 1:9, he m4 is a 14.5" while the m16 is a 20", so I would think the m4 should be a slower twist but again not completely sure. I do agree too, that every weapon is different and likes different ammo. I would like to hot load these a lil more. Do the hotter loads function and group better than factory?
