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Long Range Hunting & Shooting
twist rate for 6.5 06
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<blockquote data-quote="Hugnot" data-source="post: 2794077" data-attributes="member: 115658"><p>The Miller Twist Calculator, an estimator, is used by JBM & Berger for determining twist rates needed for adequate stability - Sg. The math is involved but not rocket science. An adequate Sg value should not be less than 1.4. Environmental factors affecting bullet stability are temperature and barometric pressure. Barometric pressure will vary with altitude - higher is lower. Humidity affects barometric pressure as the hydrogen molecules in water vapor are lighter than nitrogen molecules - humid is lower pressure.</p><p></p><p>A Sg (stabilty) table for 3, 6.5 hunting bullets that would work real good for shooting deers using a 6.5-06.</p><p>[ATTACH]454439[/ATTACH]</p><p></p><p>A table showing form factors for these & other 6.5 bullets</p><p>[ATTACH]454441[/ATTACH]</p><p></p><p>I would not consider any new 6.5-06 barrel with a twist rate slower than 8. The Berger 130 VLD looks like a good choice as its form factor is among the lowest and its lighter weight would allow greater velocities than 140 grain bullets. The 130 Berger VLD bullet should be able to kill deers good as they are not big, massive hugely heavy boned animals.</p><p></p><p>My self-imposed limit for shooting deers is 400 yards and I would shoot 127 Barnes 6.5 tipped long range bullets. Nice broadside shots on the deers are not always possible & the solid copper Barnes bullets can shoot thru 3 feet of deer if needed.</p><p></p><p>Adding Sg values for the Barnes 127 6.5 long range BT bullet:</p><p></p><p>[ATTACH]454446[/ATTACH]</p><p></p><p>The 127 Barnes would shoot good from a 9 twist, like don't re-barrel an existing 9 twist to an 8 twist for shooting deers if the 127 Barnes bullets shoot good in your rifle.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2794077, member: 115658"] The Miller Twist Calculator, an estimator, is used by JBM & Berger for determining twist rates needed for adequate stability - Sg. The math is involved but not rocket science. An adequate Sg value should not be less than 1.4. Environmental factors affecting bullet stability are temperature and barometric pressure. Barometric pressure will vary with altitude - higher is lower. Humidity affects barometric pressure as the hydrogen molecules in water vapor are lighter than nitrogen molecules - humid is lower pressure. A Sg (stabilty) table for 3, 6.5 hunting bullets that would work real good for shooting deers using a 6.5-06. [ATTACH alt="Screenshot (615).png"]454439[/ATTACH] A table showing form factors for these & other 6.5 bullets [ATTACH alt="Screenshot (612).png"]454441[/ATTACH] I would not consider any new 6.5-06 barrel with a twist rate slower than 8. The Berger 130 VLD looks like a good choice as its form factor is among the lowest and its lighter weight would allow greater velocities than 140 grain bullets. The 130 Berger VLD bullet should be able to kill deers good as they are not big, massive hugely heavy boned animals. My self-imposed limit for shooting deers is 400 yards and I would shoot 127 Barnes 6.5 tipped long range bullets. Nice broadside shots on the deers are not always possible & the solid copper Barnes bullets can shoot thru 3 feet of deer if needed. Adding Sg values for the Barnes 127 6.5 long range BT bullet: [ATTACH alt="Screenshot (616).png"]454446[/ATTACH] The 127 Barnes would shoot good from a 9 twist, like don't re-barrel an existing 9 twist to an 8 twist for shooting deers if the 127 Barnes bullets shoot good in your rifle. [/QUOTE]
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