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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Sierra .270 175gn Tipped Game King
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<blockquote data-quote="Calvin45" data-source="post: 2136136" data-attributes="member: 109862"><p>I was excited by these...at first. But if you look at the picture on sierras site you'll find it's just the 140 TGK with the bearing surface area stretched longer, the boat tail and ogive are exactly the same. Time and again it has been shown that simply making the cylindrical portion/bearing surface/whatever it's called <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> longer while leaving all other dimensions/proportions the same gains little bc in comparison to the velocity reduction caused by the extra weight. The 140 tgk has a bc of .500 and the 175 only manages .560. That's a 25 percent increase in weight for a 12 percent increase in bc. It'd take a long long distance and require very fast initial launch speeds to catch up....</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2136136, member: 109862"] I was excited by these...at first. But if you look at the picture on sierras site you’ll find it’s just the 140 TGK with the bearing surface area stretched longer, the boat tail and ogive are exactly the same. Time and again it has been shown that simply making the cylindrical portion/bearing surface/whatever it’s called :) longer while leaving all other dimensions/proportions the same gains little bc in comparison to the velocity reduction caused by the extra weight. The 140 tgk has a bc of .500 and the 175 only manages .560. That’s a 25 percent increase in weight for a 12 percent increase in bc. It’d take a long long distance and require very fast initial launch speeds to catch up.... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Sierra .270 175gn Tipped Game King
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