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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long bullets require fast twist barrels?
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<blockquote data-quote="Mikecr" data-source="post: 860985" data-attributes="member: 1521"><p>Actually, the Miller rule of thumb will work with solids, as uniform specific gravity is not needed given weight of a bullet.</p><p>Border's calculator assumes weight of the bullet is not known, as it's a bullet design tool. </p><p>Notice no bullet weight input field.</p><p></p><p>Both will pass and fail tests. I believe Borders comes from a bullet design tool written by Bill Davis, using much of Robert McCoy's math. </p><p>McCoy's approach represents more truth than rules of thumb can, but is difficult in use as many actual/difficult measurements must be taken for it.</p><p>The miller rule of thumb is useful for typical bullets in use today, as it was with Greenhill a long time ago. And it fails tests with bullets on the edge of todays 'typical' scale. But it's way better than Greenhill.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 860985, member: 1521"] Actually, the Miller rule of thumb will work with solids, as uniform specific gravity is not needed given weight of a bullet. Border's calculator assumes weight of the bullet is not known, as it's a bullet design tool. Notice no bullet weight input field. Both will pass and fail tests. I believe Borders comes from a bullet design tool written by Bill Davis, using much of Robert McCoy's math. McCoy's approach represents more truth than rules of thumb can, but is difficult in use as many actual/difficult measurements must be taken for it. The miller rule of thumb is useful for typical bullets in use today, as it was with Greenhill a long time ago. And it fails tests with bullets on the edge of todays 'typical' scale. But it's way better than Greenhill. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long bullets require fast twist barrels?
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