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Hunting
Long Range Hunting & Shooting
7mm Rem mag 168gr or even 180Gr tumble and inaccuracy with 8 twist barrel?
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<blockquote data-quote="Silly_Ghillie" data-source="post: 1627000" data-attributes="member: 107271"><p>Well, if it counts for anything- I have been using 198 grain flatline out of a 29" bbl. with a 1:9 RHT (.300 WM) and everything seems to stabilize just fine considering the aggressive twist for that weight and caliber. I get a bit more spin drift but nothing that makes me want to hack my barrel in half and pick up stamp collecting instead. I think a 1:8 for a 7mm mag is fine. </p><p></p><p>I think gyroscopic stability is relative to the bearing surface of the bullet, its overall center of gravity comparative to its center of air resistance, and the aerodynamic character of the bullet as it decelerates. I have noticed that the bigger bore players like the .375 up to .416 typically work very well with insanely tight twist rates. </p><p>Its popular to have super long bullets and the like (2+ inch bullets) in twist rates as tight as 1:7 leaving at 3000+ FPS. I mean these people are the leading edge in ballistic science and I don't think over-stabilization is an issue considering they are blasting steel at 3000+ yards with wildcats with names I cant pronounce. </p><p>Needless to say, I never bought into that argument of over stabilizing, however I never thought I would go bald or have ED- so I could be wrong.</p></blockquote><p></p>
[QUOTE="Silly_Ghillie, post: 1627000, member: 107271"] Well, if it counts for anything- I have been using 198 grain flatline out of a 29" bbl. with a 1:9 RHT (.300 WM) and everything seems to stabilize just fine considering the aggressive twist for that weight and caliber. I get a bit more spin drift but nothing that makes me want to hack my barrel in half and pick up stamp collecting instead. I think a 1:8 for a 7mm mag is fine. I think gyroscopic stability is relative to the bearing surface of the bullet, its overall center of gravity comparative to its center of air resistance, and the aerodynamic character of the bullet as it decelerates. I have noticed that the bigger bore players like the .375 up to .416 typically work very well with insanely tight twist rates. Its popular to have super long bullets and the like (2+ inch bullets) in twist rates as tight as 1:7 leaving at 3000+ FPS. I mean these people are the leading edge in ballistic science and I don't think over-stabilization is an issue considering they are blasting steel at 3000+ yards with wildcats with names I cant pronounce. Needless to say, I never bought into that argument of over stabilizing, however I never thought I would go bald or have ED- so I could be wrong. [/QUOTE]
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Long Range Hunting & Shooting
7mm Rem mag 168gr or even 180Gr tumble and inaccuracy with 8 twist barrel?
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