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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm SAUM Build Help
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<blockquote data-quote="Raffy" data-source="post: 2395702" data-attributes="member: 118545"><p>Your partially right. The factors that I know of that determine needed twist to stabilize a bullet in flight are bullet construction, weight, diameter, and length. The .5mm difference is important to factor, but minimal relative to the other bullets you are comparing when jumping from a .264 to a .308 as you referenced above. A 7mm 140 gr bullet is similar enough to a 6.5mm 140 gr bullet that my example, though not perfect, is valid. If you stray too far between calibers, like you did, your likely to get in to trouble here. It's just a guideline. Not a hard and fast rule of nature. If you don't believe me go play on the berger bullets stability calculator. I did some of the work already for you. Here, take a look-</p><p></p><p>Stabity of .284 berger 140 vld vs. .264 berger 140 vld @1 in 8 twist. They both even share the exact same stability factor of 2.42. </p><p></p><p>Case in point is: Run an 8 twist in a 7 cal shooting both 140 gr and 180 gr bullets. It will do fine! And so will 6.5 shooting 140s.</p></blockquote><p></p>
[QUOTE="Raffy, post: 2395702, member: 118545"] Your partially right. The factors that I know of that determine needed twist to stabilize a bullet in flight are bullet construction, weight, diameter, and length. The .5mm difference is important to factor, but minimal relative to the other bullets you are comparing when jumping from a .264 to a .308 as you referenced above. A 7mm 140 gr bullet is similar enough to a 6.5mm 140 gr bullet that my example, though not perfect, is valid. If you stray too far between calibers, like you did, your likely to get in to trouble here. It's just a guideline. Not a hard and fast rule of nature. If you don't believe me go play on the berger bullets stability calculator. I did some of the work already for you. Here, take a look- Stabity of .284 berger 140 vld vs. .264 berger 140 vld @1 in 8 twist. They both even share the exact same stability factor of 2.42. Case in point is: Run an 8 twist in a 7 cal shooting both 140 gr and 180 gr bullets. It will do fine! And so will 6.5 shooting 140s. [/QUOTE]
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7mm SAUM Build Help
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