[no subject]

Later on the same page (54):
"Faster twists, particularly 1 in 7, have been known to cause these
lightweight bullets to disintegrate in flight due to centrifugal forces in
excess of the bullet's design specification."

Your mileage may vary,
Eric

* The Kuleck and Duff book ranges from occasionally helpful and informative
to "let's see how many Fulton Armory gadgets we can throw on a rifle".
Sometimes I wonder if it's advertising literature or a technical reference.
See also: Lee reloading manual.