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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.220 Swift - Non Lead - 1:14 twist
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<blockquote data-quote="Calvin45" data-source="post: 2159896" data-attributes="member: 109862"><p>I've emailed Sierra some time ago about their newer 200 grain smk (not the old one, there's 2 different 30 cal 200 smks, new one is wicked slick looking). They recommend a 1:9 twist. I asked about it in my 300 win with a 10 twist. They replied the 1:9 is recommended for .308 win velocity stability, that at 300 win speeds I'd have no problems. It seems the ballistics experts there believe speed helps stabilize.</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2159896, member: 109862"] I’ve emailed Sierra some time ago about their newer 200 grain smk (not the old one, there’s 2 different 30 cal 200 smks, new one is wicked slick looking). They recommend a 1:9 twist. I asked about it in my 300 win with a 10 twist. They replied the 1:9 is recommended for .308 win velocity stability, that at 300 win speeds I’d have no problems. It seems the ballistics experts there believe speed helps stabilize. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.220 Swift - Non Lead - 1:14 twist
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