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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Twist
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<blockquote data-quote="Gandolf1" data-source="post: 77807" data-attributes="member: 4366"><p>Nowler</p><p></p><p>According to the Greenhill formulae I have the following data:</p><p></p><p>Bullet length 1.139" to 1.237" = 1 in 12 twist for a velocity less than 2800fps.</p><p></p><p>or</p><p></p><p>Bullet length 1.178" to 1.264" = 1 in 14 twist for a velocity more than 2800fps.</p><p></p><p>This is all for a 180g Sierra Gameking round at 1.2055" in length. I accept the bullet is a hunting round but I will be using it for both LR and hunting. So you see the dilema, I'm being told a 1 in 11 or 1 in 12 and the data says a 1 in 14 if I go above 2800fps.</p></blockquote><p></p>
[QUOTE="Gandolf1, post: 77807, member: 4366"] Nowler According to the Greenhill formulae I have the following data: Bullet length 1.139" to 1.237" = 1 in 12 twist for a velocity less than 2800fps. or Bullet length 1.178" to 1.264" = 1 in 14 twist for a velocity more than 2800fps. This is all for a 180g Sierra Gameking round at 1.2055" in length. I accept the bullet is a hunting round but I will be using it for both LR and hunting. So you see the dilema, I'm being told a 1 in 11 or 1 in 12 and the data says a 1 in 14 if I go above 2800fps. [/QUOTE]
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Barrel Twist
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