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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel rate of twist
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<blockquote data-quote="Gerard Schultz" data-source="post: 948348" data-attributes="member: 51"><p>That is why I said to Michael: So, some manufacturers have to lead again and we have already done so. The average shooter has no interest in such detail but, for those who do, the information should be available. It boils down to what the consumer will accept without contacting the manufacturer to change or present data better. Most manufacturers do not give useable BC data either because every manufacturer has their own ideas and most every manufacturer gives sectional density data for some obscure reason.</p><p></p><p>The Nano Tech link for a twist calculator has their terminology closer to the McCoy system and hence the head shape parameter. In the JBM calculator, they have made it a bit more user friendly by asking whether it is a secant, tangent or conical ogive/nose and putting in the extra step to do the conversion in the background. Also on the JBM calculator is an explanation of terminology.</p><p></p><p><a href="http://www.jbmballistics.com/ballistics/calculators/help/drag/drag_exp.shtml" target="_blank">http://www.jbmballistics.com/ballistics/calculators/help/drag/drag_exp.shtml</a></p></blockquote><p></p>
[QUOTE="Gerard Schultz, post: 948348, member: 51"] That is why I said to Michael: So, some manufacturers have to lead again and we have already done so. The average shooter has no interest in such detail but, for those who do, the information should be available. It boils down to what the consumer will accept without contacting the manufacturer to change or present data better. Most manufacturers do not give useable BC data either because every manufacturer has their own ideas and most every manufacturer gives sectional density data for some obscure reason. The Nano Tech link for a twist calculator has their terminology closer to the McCoy system and hence the head shape parameter. In the JBM calculator, they have made it a bit more user friendly by asking whether it is a secant, tangent or conical ogive/nose and putting in the extra step to do the conversion in the background. Also on the JBM calculator is an explanation of terminology. [url]http://www.jbmballistics.com/ballistics/calculators/help/drag/drag_exp.shtml[/url] [/QUOTE]
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Barrel rate of twist
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