When the U.S. military first adopted the M16 rifle in the 1960s, the M193 cartridge and its 55-grain bullet was standard. The earliest issued variations of Eugene Stoner’s “Black Rifle” came with relatively slow rifling twist rates of 1-in-14 inches. ...
read more at http://www.gunsandammo.com/2013/12/23/pair-barrel-twist-rates-ammo/
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