Posted November 17, 2016 10:00 am by Comments

By Keith Wood


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. Shortly thereafter, nearly all M16s and M16A1s were being issued with faster 1-in-12-inch twist barrels.

In more modern times, bullets for military and civilian use have migrated to longer, heavier designs and twist rates have been altered to stay in-sync with this progression. With so many bullets and twist rates available these days, keeping track of which ammunition is compatible with your barrel can be overwhelming.

Before we get into the weeds on individual twist rates, let’s take a minute to discuss rifling …Read the Rest

Source:: Guns and Ammo

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