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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm 175-180 SMK twist rate
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<blockquote data-quote="Kevin Thomas" data-source="post: 490532" data-attributes="member: 15748"><p>If I recall correctly, the 175 was a tangent ogive. Sierra uses the tangent as a standard default in their bullet designs, and the secant ogives in their line are the exception, not the rule.</p><p> </p><p>Wouldn't worry so much about the twist issue, either. Sierra tends to be extremely conservative in their twist recommendations, and you can often get away using something a bit slower than what they suggest. Berger, on the other hand, gives you just about what's needed for a minimum stability factor of 1.3-1.4, which is what you want.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 490532, member: 15748"] If I recall correctly, the 175 was a tangent ogive. Sierra uses the tangent as a standard default in their bullet designs, and the secant ogives in their line are the exception, not the rule. Wouldn't worry so much about the twist issue, either. Sierra tends to be extremely conservative in their twist recommendations, and you can often get away using something a bit slower than what they suggest. Berger, on the other hand, gives you just about what's needed for a minimum stability factor of 1.3-1.4, which is what you want. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm 175-180 SMK twist rate
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