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Old December 19, 2001, 12:12 AM   #3
Target Shooter
Senior Member
 
Join Date: May 19, 2000
Posts: 176
Greenhill Formula:

150 X Bullet Diameter (squared) divided by the length of the bullet in inches. The answer will be the optimum twist rate for that particular bullet.

Sample for 155g Sierra Palma Match bullet:
150X.308(squared)=.094864 divided by 1.130"=12.59 twist rate.

TS
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