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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate for 7WSM...
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<blockquote data-quote="Warren Jensen" data-source="post: 21548" data-attributes="member: 21"><p>Having a barrel cut with a specific twist for a specific bullet is a science. If you want a barrel that will shoot more than one bullet and bullet weight then you have to compromise.</p><p></p><p>My general recommendations for the two cartridges mentioned are: 1:12 is too slow, 1:8 is too fast. 1:9 or 1:9.5 is about right, unless you will use mainly lighter bullets, then 1:10. Remember, a bullet is at it's most accurate when it is "just stable" at the muzzle. This is usually considered to be a Stability Factor (SF) of 1.3-1.5. </p><p></p><p>A 1:8 would be appropriate for an extremely optimized and heavy VLD. A 1:12 won't stabilize some heavier 7mm bullets at moderate velocities.</p></blockquote><p></p>
[QUOTE="Warren Jensen, post: 21548, member: 21"] Having a barrel cut with a specific twist for a specific bullet is a science. If you want a barrel that will shoot more than one bullet and bullet weight then you have to compromise. My general recommendations for the two cartridges mentioned are: 1:12 is too slow, 1:8 is too fast. 1:9 or 1:9.5 is about right, unless you will use mainly lighter bullets, then 1:10. Remember, a bullet is at it's most accurate when it is "just stable" at the muzzle. This is usually considered to be a Stability Factor (SF) of 1.3-1.5. A 1:8 would be appropriate for an extremely optimized and heavy VLD. A 1:12 won't stabilize some heavier 7mm bullets at moderate velocities. [/QUOTE]
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Twist rate for 7WSM...
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