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Hunting
The Basics, Starting Out
6mm Remington
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<blockquote data-quote="merbeau" data-source="post: 568155" data-attributes="member: 38494"><p>Hi </p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">New to this site and saw this post. I am in the process of building a varmint/target rifle (300 to 600 yards matches) based on the 6mm LR and have decided on a 1:9 twist. There is a formula for bullet stability called the Miller Coefficient which uses bullet weight, bullet length, velocity, caliber, temperature, altitude and twist rate to calculate a value. Values from 1.4 to 2.5 are acceptable for stabilizing bullets. Anything less than 1.4 would be not stable and anything above 2.5 would be to fast (i.e., bullet spins to fast). The military has adopted values from 1.5 to 2.5 for their use. I have programmed this equation into an Excel 7 spreadsheet and you are welcome to use it for your own application. Just let me know. </span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Thanks</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Robert</span></span></p></blockquote><p></p>
[QUOTE="merbeau, post: 568155, member: 38494"] Hi [COLOR=black][FONT=Verdana]New to this site and saw this post. I am in the process of building a varmint/target rifle (300 to 600 yards matches) based on the 6mm LR and have decided on a 1:9 twist. There is a formula for bullet stability called the Miller Coefficient which uses bullet weight, bullet length, velocity, caliber, temperature, altitude and twist rate to calculate a value. Values from 1.4 to 2.5 are acceptable for stabilizing bullets. Anything less than 1.4 would be not stable and anything above 2.5 would be to fast (i.e., bullet spins to fast). The military has adopted values from 1.5 to 2.5 for their use. I have programmed this equation into an Excel 7 spreadsheet and you are welcome to use it for your own application. Just let me know. [/FONT][/COLOR] [COLOR=black][FONT=Verdana][/FONT][/COLOR] [COLOR=black][FONT=Verdana]Thanks[/FONT][/COLOR] [COLOR=black][FONT=Verdana][/FONT][/COLOR] [COLOR=black][FONT=Verdana]Robert[/FONT][/COLOR] [/QUOTE]
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Hunting
The Basics, Starting Out
6mm Remington
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