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Long Range Hunting & Shooting
Who's stretching it out with a 270 WSM?
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<blockquote data-quote="MuleHunter" data-source="post: 628145" data-attributes="member: 14190"><p>Thanks for answering my question about the new EOL .277 bullet length Bob.</p><p> </p><p>For those interested; i went on to JBM ballistics to play with the Miller stability calculator. In a 270 WSM, 9 twist barrel, at 2,900fps, in 10*F weather, and 30.00hg (a cold day at sea level) the stabiltity factor is 1.217. Most people recommend a stability factor of 1.4 for a just in case condition. The bullet does not destabilize unless it has an SG of 1.0. </p><p> </p><p>So for those of you who have a 9 twist 270 WSM (like me) unless you are at sea level in sub zero temps you will likely be able to stabilize the 170 Berger EOL. I plan to try it for sure since the worst hunting conditions i am usually in are about 20*F and 26.00hg (which would give me a SG of 1.434). As temp and elevation go up the stability does as well.</p><p> </p><p>Im sure Brian Litz was giving the minimum twist for comfortable stability (SG 1.4) in the worst conditions which is understandable for recommending a twist.</p></blockquote><p></p>
[QUOTE="MuleHunter, post: 628145, member: 14190"] Thanks for answering my question about the new EOL .277 bullet length Bob. For those interested; i went on to JBM ballistics to play with the Miller stability calculator. In a 270 WSM, 9 twist barrel, at 2,900fps, in 10*F weather, and 30.00hg (a cold day at sea level) the stabiltity factor is 1.217. Most people recommend a stability factor of 1.4 for a just in case condition. The bullet does not destabilize unless it has an SG of 1.0. So for those of you who have a 9 twist 270 WSM (like me) unless you are at sea level in sub zero temps you will likely be able to stabilize the 170 Berger EOL. I plan to try it for sure since the worst hunting conditions i am usually in are about 20*F and 26.00hg (which would give me a SG of 1.434). As temp and elevation go up the stability does as well. Im sure Brian Litz was giving the minimum twist for comfortable stability (SG 1.4) in the worst conditions which is understandable for recommending a twist. [/QUOTE]
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Who's stretching it out with a 270 WSM?
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