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Rifles, Reloading, Optics, Equipment
Reloading
14 twist barrel and 68 gr .224 bullets
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<blockquote data-quote="jkrische" data-source="post: 81609" data-attributes="member: 4558"><p>Thank the Shooting Gods. I found the equation in the Sept. issue of Shooting Times. It's known as the "Greenhill Formula". The equation is as follows: T x L = 150 where T is the twist rate in calibers and L is the length of bullet in calibers. This applies to lead bullets specifically but can also be used for jacketed lead bullets. So for a .224 caliber bullet; For a 1:7" twist the Max bullet length, L= 150/T (31.25 in this case for a .224 diameter; 7/.224). Max bullet length (est.)= 150/31.25 = 4.8 calibers.</p><p>4.8 x .224= 1.0752" Max (est) bullet length for a 1:7 twist. This is an estimated value but it should be fairly close. This length does not include any plastic tips.</p></blockquote><p></p>
[QUOTE="jkrische, post: 81609, member: 4558"] Thank the Shooting Gods. I found the equation in the Sept. issue of Shooting Times. It's known as the "Greenhill Formula". The equation is as follows: T x L = 150 where T is the twist rate in calibers and L is the length of bullet in calibers. This applies to lead bullets specifically but can also be used for jacketed lead bullets. So for a .224 caliber bullet; For a 1:7" twist the Max bullet length, L= 150/T (31.25 in this case for a .224 diameter; 7/.224). Max bullet length (est.)= 150/31.25 = 4.8 calibers. 4.8 x .224= 1.0752" Max (est) bullet length for a 1:7 twist. This is an estimated value but it should be fairly close. This length does not include any plastic tips. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
14 twist barrel and 68 gr .224 bullets
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