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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
??? Gain, Progressive, Incremental, or Transitional Twist
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<blockquote data-quote="Bart B" data-source="post: 500495" data-attributes="member: 5302"><p>I read that article.</p><p></p><p>I don't understand why the 370-gr. bullet needs to be spun about 270,000 rpm when Sierra's 350-gr. MK needs only about 180,000 rpm to stabilize it at the same muzzle velocity. If it's the Rocky Mtn. one, their specs says it needs only about 200,000 rpm to stabilize it; and that's at 3100 fps which means it needs to be spun a tiny bit faster that at 2925 fps.</p><p></p><p>Someone, please help me understand this. That gain twist barrel's rifling angle to the bullet goes from 4.2 degrees to 8.8 degrees. Seems to me that's a lot of jacket material that gets relocated.</p><p></p><p>I'd like to see a 20-shot group fired at 600 yards with these bullets spun 280,000 rpm as they leave the barrel.</p></blockquote><p></p>
[QUOTE="Bart B, post: 500495, member: 5302"] I read that article. I don't understand why the 370-gr. bullet needs to be spun about 270,000 rpm when Sierra's 350-gr. MK needs only about 180,000 rpm to stabilize it at the same muzzle velocity. If it's the Rocky Mtn. one, their specs says it needs only about 200,000 rpm to stabilize it; and that's at 3100 fps which means it needs to be spun a tiny bit faster that at 2925 fps. Someone, please help me understand this. That gain twist barrel's rifling angle to the bullet goes from 4.2 degrees to 8.8 degrees. Seems to me that's a lot of jacket material that gets relocated. I'd like to see a 20-shot group fired at 600 yards with these bullets spun 280,000 rpm as they leave the barrel. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
??? Gain, Progressive, Incremental, or Transitional Twist
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