snox801
Well-Known Member
Only partially true depends on barrel length. The .223 will outperform the 6mm with a longer barrel. The 6mm will outperform the .223 in shorter tubes which is mainly what we are talking about.Because the bore is bigger you get better performance for any given grain weight. A 223 77 grain at 3100fps vs. a 80 grain 6x45 at 3500+. Pretty significant.