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How To Calculate Rifling Twist Rates For Stabilizing Bullets

How heavy or light a bullet will your rifle accurately shoot?

Speer’s Index Numbers: A 1950s Shot At Logical Wildcats

Whatever happened to Speer’s “Index Number” of the 1950s? Art Merrill looks back at the...

A Page from History: Rifling Twist and Bullet Flight

From the September 1951 issue of American Rifleman.