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Berger’s Twist Rate Calculator: Putting The Right Twist On Bullets

Berger’s online Twist Rate Calculator is an easy-to-use and versatile tool. Best of all, it’s free.

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 mystique of wildcat cartridges. Wildcatting was popular enough back in the day to warrant Speer to create index numbers matching bullets and case for max “efficiency”

A Page from History: Rifling Twist and Bullet Flight

From the September 1951 issue of American Rifleman.

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