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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Matrix 117g 6mm not stabilized in 1-7.5??
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<blockquote data-quote="Max Heat" data-source="post: 678076" data-attributes="member: 43153"><p>Do you like math?? I believe this is known as the "greenhill" formula (I hope it formats correctly when I save the post - it may not): </p><p>Define the Variables: T = Twist rate in 1 turn per inches. L = Bullet length in inches. V = Muzzle Velocity D = Diameter of the bore grooves in inches. Constant = 3.5 Find the optimum twist rate from velocity, bore size and bullet length: T= ( 3.5 * SqRt( V ) * D² ) ÷ L Find the optimum bullet length from velocity, bore size and twist rate: L = ( 3.5 * SqRt( V ) * D² ) ÷ T Find the optimum muzzle velocity from bullet length, bore size and twist rate: V = ( L * T ÷ D² ÷ 3.5 )² Find a different constant to fit known optimim combinations. Constant = L * T ÷ D² ÷ SqRt( V )</p></blockquote><p></p>
[QUOTE="Max Heat, post: 678076, member: 43153"] Do you like math?? I believe this is known as the "greenhill" formula (I hope it formats correctly when I save the post - it may not): Define the Variables: T = Twist rate in 1 turn per inches. L = Bullet length in inches. V = Muzzle Velocity D = Diameter of the bore grooves in inches. Constant = 3.5 Find the optimum twist rate from velocity, bore size and bullet length: T= ( 3.5 * SqRt( V ) * D² ) ÷ L Find the optimum bullet length from velocity, bore size and twist rate: L = ( 3.5 * SqRt( V ) * D² ) ÷ T Find the optimum muzzle velocity from bullet length, bore size and twist rate: V = ( L * T ÷ D² ÷ 3.5 )² Find a different constant to fit known optimim combinations. Constant = L * T ÷ D² ÷ SqRt( V ) [/QUOTE]
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Matrix 117g 6mm not stabilized in 1-7.5??
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